RFC 9909: Internet X.509 Public Key Infrastructure -- Algorithm Identifiers for the Stateless Hash-Based Digital Signature Algorithm (SLH-DSA)
Author: Kaveh Bashiri
Description: Digital signatures are used within the X.509 Public Key Infrastructure, such as X.509 certificates and Certificate Revocation Lists (CRLs), as well as to sign messages. This document specifies the conventions for using the Stateless Hash-Based Digital Signature Algorithm (SLH-DSA) in the X.509 Public Key Infrastructure. The conventions for the associated signatures, subject public keys, and private keys are also specified.

RFC 9909 | SLH-DSA for X.509 | December 2025
Bashiri, et al. | Standards Track | [Page]

Stream:
  Internet Engineering Task Force (IETF)
RFC:
  9909
Category:
  Standards Track
Published:
  December 2025
ISSN:
  2070-1721
Authors:
  K. Bashiri
  BSI
  S. Fluhrer
  Cisco Systems
  S. Gazdag
  genua GmbH
  D. Van Geest
  CryptoNext Security
  S. Kousidis
  BSI

# RFC 9909

# Internet X.509 Public Key Infrastructure -- Algorithm Identifiers for the Stateless Hash-Based Digital Signature Algorithm (SLH-DSA)

## Abstract

Digital signatures are used within the X.509 Public Key Infrastructure, such as X.509 certificates and Certificate Revocation Lists (CRLs), as well as to sign messages. This document specifies the conventions for using the Stateless Hash-Based Digital Signature Algorithm (SLH-DSA) in the X.509 Public Key Infrastructure. The conventions for the associated signatures, subject public keys, and private keys are also specified.¶

## Status of This Memo

This is an Internet Standards Track document.¶

This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841.¶

Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at https://www.rfc-editor.org/info/rfc9909.¶

## Copyright Notice

Copyright (c) 2025 IETF Trust and the persons identified as the document authors. All rights reserved.¶

This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License.¶

## 1. Introduction

The Stateless Hash-Based Digital Signature Algorithm (SLH-DSA) is a quantum-resistant digital signature scheme standardized in [FIPS205] by the US National Institute of Standards and Technology (NIST) Post-Quantum Cryptography (PQC) project [NIST-PQC]. Prior to standardization, the algorithm was known as SPHINCS+. SLH-DSA and SPHINCS+ are not compatible. This document defines the ASN.1 Object Identifiers (OIDs) and conventions for the encoding of SLH-DSA digital signatures, public keys, and private keys in the X.509 Public Key Infrastructure.¶

SLH-DSA offers three security levels. The parameters for each of the security levels were chosen to be at least as secure as a generic block cipher of 128, 192, or 256 bits. There are small (s) and fast (f) versions of the algorithm, and there is also the option to use the SHA-2 algorithm family [FIPS180] or SHAKE256 [FIPS202] as internal functions. While the fast versions are optimized for key generation and signing speed, they are actually slower at verification than the SLH-DSA small parameter sets. The small versions are optimized for signature size; see Table 1. As an example, id-slh-dsa-shake-256s represents the 256-bit security level, the small version of the algorithm, and the use of SHAKE256.¶

NIST [CSOR] has assigned separate algorithm identifiers for SLH-DSA for each combination of these security levels: fast vs. small, SHA-2 vs. SHAKE256, and pure mode vs. pre-hash mode.¶

SLH-DSA signature operations include an optional context string (ctx) as input, defined in Section 10.2 of [FIPS205]. The context string has a maximum length of 255 bytes. By default, the context string is the empty string. This document only specifies the use of the empty context string for use in the X.509 Public Key Infrastructure.¶

SLH-DSA offers two signature modes: pure mode, where the entire content is signed directly, and pre-hash mode, where a digest of the content is signed. This document uses the term SLH-DSA to refer to the algorithm in general. When a pure or pre-hash mode needs to be differentiated, the terms Pure SLH-DSA and HashSLH-DSA are used. This document specifies the use of both Pure SLH-DSA and HashSLH-DSA in Public Key Infrastructure X.509 (PKIX) certificates and Certificate Revocation Lists (CRLs).¶

### 1.1. Notation

The following notation is used in this document:¶

a || b:
  Concatenation of a and b.¶
id-slh-dsa-*:
  A shorthand to refer to all 12 OIDs used to specify the different parameter combinations for Pure SLH-DSA.¶
id-hash-slh-dsa-*:
  A shorthand to refer to all 12 OIDs used to specify the different parameter combinations for HashSLH-DSA.¶

## 2. Conventions

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.¶

## 3. Algorithm Identifiers

The AlgorithmIdentifier type is defined in [RFC5912] as follows:¶

    AlgorithmIdentifier{ALGORITHM-TYPE, ALGORITHM-TYPE:AlgorithmSet} ::=
            SEQUENCE {
                algorithm   ALGORITHM-TYPE.&id({AlgorithmSet}),
                parameters  ALGORITHM-TYPE.
                       &Params({AlgorithmSet}{@algorithm}) OPTIONAL
            }

¶

NOTE: The above syntax is from [RFC5912] and is compatible with the 2021 ASN.1 syntax [X680]. See [RFC5280] for the 1988 ASN.1 syntax.¶

The fields in AlgorithmIdentifier have the following meanings:¶

- algorithm identifies the cryptographic algorithm with an object identifier.¶

- parameters, which is optional, identifies the associated parameters for the algorithm identifier in the algorithm field.¶

The object identifiers for SLH-DSA are defined in the NIST Computer Security Objects Register [CSOR] and are reproduced here for convenience. The same algorithm identifiers are used for identifying a public key, a private key, and a signature.¶

The Pure SLH-DSA OIDs are defined in the ASN.1 module in [RFC9814] and reproduced here for convenience:¶

       nistAlgorithms OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
         country(16) us(840) organization(1) gov(101) csor(3) 4 }

       sigAlgs OBJECT IDENTIFIER ::= { nistAlgorithms 3 }

       id-slh-dsa-sha2-128s OBJECT IDENTIFIER ::= { sigAlgs 20 }

       id-slh-dsa-sha2-128f OBJECT IDENTIFIER ::= { sigAlgs 21 }

       id-slh-dsa-sha2-192s OBJECT IDENTIFIER ::= { sigAlgs 22 }

       id-slh-dsa-sha2-192f OBJECT IDENTIFIER ::= { sigAlgs 23 }

       id-slh-dsa-sha2-256s OBJECT IDENTIFIER ::= { sigAlgs 24 }

       id-slh-dsa-sha2-256f OBJECT IDENTIFIER ::= { sigAlgs 25 }

       id-slh-dsa-shake-128s OBJECT IDENTIFIER ::= { sigAlgs 26 }

       id-slh-dsa-shake-128f OBJECT IDENTIFIER ::= { sigAlgs 27 }

       id-slh-dsa-shake-192s OBJECT IDENTIFIER ::= { sigAlgs 28 }

       id-slh-dsa-shake-192f OBJECT IDENTIFIER ::= { sigAlgs 29 }

       id-slh-dsa-shake-256s OBJECT IDENTIFIER ::= { sigAlgs 30 }

       id-slh-dsa-shake-256f OBJECT IDENTIFIER ::= { sigAlgs 31 }

¶

The HashSLH-DSA OIDs are:¶

       nistAlgorithms OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
         country(16) us(840) organization(1) gov(101) csor(3) 4 }

       sigAlgs OBJECT IDENTIFIER ::= { nistAlgorithms 3 }

       id-hash-slh-dsa-sha2-128s-with-sha256 OBJECT IDENTIFIER ::= {
          sigAlgs 35 }

       id-hash-slh-dsa-sha2-128f-with-sha256 OBJECT IDENTIFIER ::= {
          sigAlgs 36 }

       id-hash-slh-dsa-sha2-192s-with-sha512 OBJECT IDENTIFIER ::= {
          sigAlgs 37 }

       id-hash-slh-dsa-sha2-192f-with-sha512 OBJECT IDENTIFIER ::= {
          sigAlgs 38 }

       id-hash-slh-dsa-sha2-256s-with-sha512 OBJECT IDENTIFIER ::= {
          sigAlgs 39 }

       id-hash-slh-dsa-sha2-256f-with-sha512 OBJECT IDENTIFIER ::= {
          sigAlgs 40 }

       id-hash-slh-dsa-shake-128s-with-shake128 OBJECT IDENTIFIER ::= {
          sigAlgs 41 }

       id-hash-slh-dsa-shake-128f-with-shake128 OBJECT IDENTIFIER ::= {
          sigAlgs 42 }

       id-hash-slh-dsa-shake-192s-with-shake256 OBJECT IDENTIFIER ::= {
          sigAlgs 43 }

       id-hash-slh-dsa-shake-192f-with-shake256 OBJECT IDENTIFIER ::= {
          sigAlgs 44 }

       id-hash-slh-dsa-shake-256s-with-shake256 OBJECT IDENTIFIER ::= {
          sigAlgs 45 }

       id-hash-slh-dsa-shake-256f-with-shake256 OBJECT IDENTIFIER ::= {
          sigAlgs 46 }

¶

The contents of the parameters component for each algorithm MUST be absent.¶

## 4. SLH-DSA Signatures

SLH-DSA is a digital signature scheme built upon hash functions. The security of SLH-DSA relies on the security properties of the underlying hash functions, such as the presumed difficulty of finding preimages.¶

Signatures can be placed in a number of different ASN.1 structures. The top-level structure for a certificate is given below as being illustrative of how signatures are frequently encoded with an algorithm identifier and a location for the signature.¶

      Certificate  ::=  SIGNED{ TBSCertificate }

      SIGNED{ToBeSigned} ::= SEQUENCE {
         toBeSigned           ToBeSigned,
         algorithmIdentifier  SEQUENCE {
             algorithm        SIGNATURE-ALGORITHM.
                                &id({SignatureAlgorithms}),
             parameters       SIGNATURE-ALGORITHM.
                                &Params({SignatureAlgorithms}
                                  {@algorithmIdentifier.algorithm})
                                    OPTIONAL
         },
         signature BIT STRING (CONTAINING SIGNATURE-ALGORITHM.&Value(
                                  {SignatureAlgorithms}
                                  {@algorithmIdentifier.algorithm}))
      }

¶

NOTE: The above syntax is from [RFC5912] and is compatible with the 2021 ASN.1 syntax [X680]. See [RFC5280] for the 1988 ASN.1 syntax.¶

The algorithm identifiers used for signatures are the same as those used for public keys. When used to identify signature algorithms, the parameters MUST be absent.¶

The data to be signed is prepared for SLH-DSA. Then, a private key operation is performed to generate the raw signature value.¶

When signing data using the Pure SLH-DSA signature algorithm, Algorithm 22 (slh_sign) from Section 10.2.1 of [FIPS205] is used. When verifying Pure SLH-DSA signed data, Algorithm 24 (slh_verify) from Section 10.3 of [FIPS205] is used. When signing data using the HashSLH-DSA signature algorithm, Algorithm 23 (hash_slh_sign) from Section 10.2.2 of [FIPS205] is used. When verifying HashSLH-DSA signed data, Algorithm 25 (hash_slh_verify) from Section 10.3 of [FIPS205] is used. All four of these algorithms create a message, M', from the message to be signed along with other data, and M' is operated on by internal SLH-DSA algorithms. M' may be constructed outside the module that performs the internal SLH-DSA algorithms.¶

In the case of HashSLH-DSA, there is a pre-hash component of M' referred to as PH_M. PH_M may be computed in the signing/verifying module; in which case, the entire message to be signed is sent to the module. Alternatively, PH_M may be computed in a different module. In this case, either PH_M is sent to the signing/verifying module, which creates M', or M' is created outside the signing/verifying module and is sent to the module. HashSLH-DSA allows this implementation flexibility in order to reduce, and make consistent, the amount of data transferred to signing/verifying modules. The hash algorithm or extendable-output function (XOF) used to generate the pre-hash when signing and verifying with HashSLH-DSA is specified after the "-with-" component of the signature algorithm name. For example, when signing with id-hash-slh-dsa-sha2-128s-with-sha256, SHA-256 is used as the pre-hash algorithm. When pre-hashing is performed using SHAKE128, the output length is 256 bits. When pre-hashing is performed using SHAKE256, the output length is 512 bits.¶

Section 9.2 of [FIPS205] defines an SLH-DSA signature as three elements: R, SIG_FORS, and SIG_HT. The raw octet string encoding of an SLH-DSA signature is the concatenation of these three elements, i.e., R || SIG_FORS || SIG_HT. The raw octet string representing the signature is encoded directly in the BIT STRING without adding any additional ASN.1 wrapping. For example, in the Certificate structure, the raw signature value is encoded in the "signature" BIT STRING field.¶

## 5. Subject Public Key Fields

In the X.509 certificate, the subjectPublicKeyInfo field has the SubjectPublicKeyInfo type, which has the following ASN.1 syntax:¶

      SubjectPublicKeyInfo {PUBLIC-KEY: IOSet} ::= SEQUENCE {
          algorithm        AlgorithmIdentifier {PUBLIC-KEY, {IOSet}},
          subjectPublicKey BIT STRING }

¶

NOTE: The above syntax is from [RFC5912] and is compatible with the 2021 ASN.1 syntax [X680]. See [RFC5280] for the 1988 ASN.1 syntax.¶

The fields in SubjectPublicKeyInfo have the following meanings:¶

- algorithm is the algorithm identifier and parameters for the public key (see above).¶

- subjectPublicKey contains the byte stream of the public key.¶

[RFC9814] defines the following public key identifiers for Pure SLH-DSA:¶

       pk-slh-dsa-sha2-128s PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-sha2-128s
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-sha2-128f PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-sha2-128f
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-sha2-192s PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-sha2-192s
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-sha2-192f PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-sha2-192f
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-sha2-256s PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-sha2-256s
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-sha2-256f PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-sha2-256f
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-shake-128s PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-shake-128s
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-shake-128f PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-shake-128f
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-shake-192s PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-shake-192s
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-shake-192f PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-shake-192f
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-shake-256s PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-shake-256s
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-slh-dsa-shake-256f PUBLIC-KEY ::= {
          IDENTIFIER id-slh-dsa-shake-256f
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       SLH-DSA-PublicKey ::= OCTET STRING

       SLH-DSA-PrivateKey ::= OCTET STRING

¶

The public key identifiers for HashSLH-DSA are defined here:¶

       pk-hash-slh-dsa-sha2-128s-with-sha256 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-sha2-128s-with-sha256
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-sha2-128f-with-sha256 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-sha2-128f-with-sha256
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-sha2-192s-with-sha512 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-sha2-192s-with-sha512
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-sha2-192f-with-sha512 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-sha2-192f-with-sha512
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-sha2-256s-with-sha512 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-sha2-256s-with-sha512
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-sha2-256f-with-sha512 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-sha2-256f-with-sha512
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-shake-128s-with-shake128 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-shake-128s-with-shake128
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-shake-128f-with-shake128 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-shake-128f-with-shake128
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-shake-192s-with-shake256 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-shake-192s-with-shake256
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-shake-192f-with-shake256 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-shake-192f-with-shake256
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-shake-256s-with-shake256 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-shake-256s-with-shake256
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

       pk-hash-slh-dsa-shake-256f-with-shake256 PUBLIC-KEY ::= {
          IDENTIFIER id-hash-slh-dsa-shake-256f-with-shake256
          -- KEY no ASN.1 wrapping --
          CERT-KEY-USAGE
             { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
          -- PRIVATE-KEY no ASN.1 wrapping -- }

¶

Section 9.1 of [FIPS205] defines an SLH-DSA public key as two n-byte elements: PK.seed and PK.root. The raw octet string encoding of an SLH-DSA public key is the concatenation of these two elements, i.e., PK.seed || PK.root. The octet string length is 2*n bytes, where n is 16, 24, or 32, depending on the SLH-DSA parameter set. When used in a SubjectPublicKeyInfo type, the subjectPublicKey BIT STRING contains the raw octet string encoding of the public key.¶

[RFC9814] defines the SLH-DSA-PublicKey and SLH-DSA-PrivateKey ASN.1 OCTET STRING types to provide an option for encoding a Pure SLH-DSA public or private key in an environment that uses ASN.1 encoding but doesn't define its own mapping of an SLH-DSA raw octet string to ASN.1. HashSLH-DSA public and private keys can use SLH-DSA-PublicKey and SLH-DSA-PrivateKey in the same way. To map an SLH-DSA-PublicKey OCTET STRING to a SubjectPublicKeyInfo, the OCTET STRING is mapped to the subjectPublicKey field (a value of type BIT STRING) as follows: The most significant bit of the OCTET STRING value becomes the most significant bit of the BIT STRING value, and so on; the least significant bit of the OCTET STRING becomes the least significant bit of the BIT STRING.¶

The AlgorithmIdentifier for an SLH-DSA public key MUST use one of the id-slh-dsa-* or id-hash-slh-dsa-* object identifiers from Section 3. The parameters field of the AlgorithmIdentifier for the SLH-DSA public key MUST be absent.¶

Appendix C.1 contains an example of an id-slh-dsa-sha2-128s public key encoded using the textual encoding defined in [RFC7468].¶

## 6. Key Usage Bits

The intended application for the key is indicated in the keyUsage certificate extension; see Section 4.2.1.3 of [RFC5280]. If the keyUsage extension is present in a certificate that indicates an id-slh-dsa-* (Pure SLH-DSA) or id-hash-slh-dsa-* (HashSLH-DSA) identifier in the SubjectPublicKeyInfo, then at least one of the following MUST be present:¶

- digitalSignature¶
- nonRepudiation¶
- keyCertSign¶
- cRLSign¶

If the keyUsage extension is present in a certificate that indicates an id-slh-dsa-* (Pure SLH-DSA) or id-hash-slh-dsa-* (HashSLH-DSA) identifier in the SubjectPublicKeyInfo, then the following MUST NOT be present:¶

- keyEncipherment¶
- dataEncipherment¶
- keyAgreement¶
- encipherOnly¶
- decipherOnly¶

Requirements about the keyUsage extension bits defined in [RFC5280] still apply.¶

## 7. Private Key Format

"Asymmetric Key Packages" [RFC5958] describes how to encode a private key in a structure that both identifies what algorithm the private key is for and optionally allows for the public key and additional attributes about the key to be included as well. For illustration, the ASN.1 structure OneAsymmetricKey is replicated below.¶

       OneAsymmetricKey ::= SEQUENCE {
          version Version,
          privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
          privateKey PrivateKey,
          attributes [0] IMPLICIT Attributes OPTIONAL,
          ...,
          [[2: publicKey [1] IMPLICIT PublicKey OPTIONAL ]],
          ...
       }

       PrivateKey ::= OCTET STRING

       PublicKey ::= BIT STRING

¶

NOTE: The above syntax is from [RFC5958] and is compatible with the 2021 ASN.1 syntax [X680].¶

Section 9.1 of [FIPS205] defines an SLH-DSA private key as four n-byte elements: SK.seed, SK.prf, PK.seed, and PK.root. The raw octet string encoding of an SLH-DSA private key is the concatenation of these four elements, i.e., SK.seed || SK.prf || PK.seed || PK.root. The octet string length is 4*n bytes, where n is 16, 24, or 32, depending on the SLH-DSA parameter set. When used in a OneAsymmetricKey type, the privateKey OCTET STRING contains the raw octet string encoding of the private key.¶

When an SLH-DSA public key is included in a OneAsymmetricKey type, it is encoded in the same manner as in a SubjectPublicKeyInfo type. That is, the publicKey BIT STRING contains the raw octet string encoding of the public key.¶

Appendix C.2 contains an example of an id-slh-dsa-sha2-128s private key encoded using the textual encoding defined in [RFC7468].¶

NOTE: There exist some private key import functions that have not picked up the ASN.1 structure OneAsymmetricKey, which is defined in [RFC5958]. This means that they will not accept a private key structure that contains the public key field. This means a balancing act needs to be done between being able to do a consistency check on the key pair and widest ability to import the key.¶

## 8. Operational Considerations

SLH-DSA uses the same OID to identify a public key and a signature algorithm. The implication of this is that, despite being mathematically possible, an SLH-DSA key identified by a Pure SLH-DSA OID is not permitted to be used to generate or verify a signature identified by a HashSLH-DSA OID, and vice versa.¶

Certification authority (CA) operators will need to decide in advance whether their CA certificates will use Pure SLH-DSA or HashSLH-DSA and assign the appropriate OID to the public and private keys when generating their certificate. Some of the following considerations may affect this decision.¶

- When using an external signing module, such as a Hardware Security Module (HSM), the size of data that can be transferred to and processed by the signature module may be limited. SLH-DSA performs two passes on the internal M' message, so it must be held in memory. Using HashSLH-DSA reduces the size of M'.¶

- Large CRLs might also exceed the size limits of HSM signing operations when using Pure SLH-DSA. One way to limit the size of CRLs is to make use of CRL Distribution Points and Issuing Distribution Points to create partitioned CRLs in accordance with Section 5.2.5 of [RFC5280].¶

- End Entity (EE) certificates with many subject alternative names (SANs) might also exceed the size limits of HSM signing operations.¶

- Potential verifiers' environments might need to be considered. The entire certificate or CRL needs to be held in memory during SLH-DSA signature verification; it cannot be streamed. In particular, there is a randomizer (R) that is extracted from the SLH-DSA signature and fed to a digest function before M' is. Thus, to stream a message for SLH-DSA verification, the signature must come before the message. This is not the case for certificates and CRLs. Using HashSLH-DSA reduces the size of the M' being held in memory.¶

An SLH-DSA private key has a very large (264) number of signatures it can safely generate (see Section 9). If an operator might conceivably generate a number of signatures approaching this limit, they should mitigate potential harm by tracking the number of signatures generated and destroying the private key once an appropriate limit is reached or by setting the "Not After" (expiration) date of the certificate such that the limit couldn't possibly be surpassed given the rate of signing.¶

## 9. Security Considerations

The security considerations of [RFC5280] apply accordingly. Moreover, the security aspects mentioned throughout [FIPS205] should be taken into account; for instance, see Sections 3.1 and 3.2 or the beginning of Section 11.¶

The security of SLH-DSA relies on the security properties of the internal hash and XOF functions. In particular, it relies on these functions being preimage resistant, but it does not rely on them being collision resistant. Since HashSLH-DSA performs a pre-hash before signing, it relies on both preimage resistance and collision resistance of the pre-hash function. In order to achieve an appropriate level of collision resistance, the output length of the pre-hash functions used for HashSLH-DSA is twice the length of the internal hash and XOF functions.¶

Implementations MUST protect the private keys. Compromise of the private keys may result in the ability to forge signatures.¶

When generating an SLH-DSA key pair, an implementation MUST generate each key pair independently of all other key pairs in the SLH-DSA hypertree.¶

An SLH-DSA tree MUST NOT be used for more than 264 signing operations.¶

The generation of private keys relies on random numbers. The use of inadequate pseudorandom number generators (PRNGs) to generate these values can result in little or no security. An attacker may find it much easier to reproduce the PRNG environment that produced the keys, searching the resulting small set of possibilities, rather than brute force searching the whole key space. The generation of quality random numbers is difficult; see Section 3.1 of [FIPS205] for some additional information.¶

Fault attacks can lead to forgeries of message signatures; see [CMP2018] and [Ge2023]. Verifying a signature before releasing the signature value is a typical fault attack countermeasure; however, this countermeasure is not effective for SLH-DSA [Ge2023]. Redundancy by replicating the signature generation process can be used as an effective fault attack countermeasure for SLH-DSA [Ge2023]; however, the SLH-DSA signature generation is already considered slow.¶

Likewise, passive power and emissions side-channel attacks can leak the SLH-DSA private signing key, and countermeasures can be taken against these attacks [SLotH].¶

## 10. IANA Considerations

For the ASN.1 module in Appendix A of this document, IANA has assigned an object identifier (OID) for the module identifier (120) with a Description of "id-mod-x509-slh-dsa-2025". The OID for the module has been allocated in the "SMI Security for PKIX Module Identifier" registry (1.3.6.1.5.5.7.0).¶

## 11. References

### 11.1. Normative References

[CSOR]
  NIST, "Computer Security Objects Register (CSOR)", 13 June 2025, <https://csrc.nist.gov/projects/computer-security-objects-register/algorithm-registration>.
[FIPS205]
  NIST, "Stateless Hash-Based Digital Signature Standard", NIST FIPS 205, DOI 10.6028/NIST.FIPS.205, 13 August 2024, <https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.205.pdf>.
[RFC2119]
  Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, <https://www.rfc-editor.org/info/rfc2119>.
[RFC5280]
  Cooper, D., Santesson, S., Farrell, S., Boeyen, S., Housley, R., and W. Polk, "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", RFC 5280, DOI 10.17487/RFC5280, May 2008, <https://www.rfc-editor.org/info/rfc5280>.
[RFC5912]
  Hoffman, P. and J. Schaad, "New ASN.1 Modules for the Public Key Infrastructure Using X.509 (PKIX)", RFC 5912, DOI 10.17487/RFC5912, June 2010, <https://www.rfc-editor.org/info/rfc5912>.
[RFC5958]
  Turner, S., "Asymmetric Key Packages", RFC 5958, DOI 10.17487/RFC5958, August 2010, <https://www.rfc-editor.org/info/rfc5958>.
[RFC8174]
  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC9814]
  Housley, R., Fluhrer, S., Kampanakis, P., and B. Westerbaan, "Use of the SLH-DSA Signature Algorithm in the Cryptographic Message Syntax (CMS)", RFC 9814, DOI 10.17487/RFC9814, July 2025, <https://www.rfc-editor.org/info/rfc9814>.
[X680]
  ITU-T, "Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation", ITU-T Recommendation X.680, ISO/IEC 8824-1:2021, February 2021, <https://www.itu.int/rec/T-REC-X.680>.
[X690]
  ITU-T, "Information technology - ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)", ITU-T Recommendation X.690, ISO/IEC 8825-1:2021, February 2021, <https://www.itu.int/rec/T-REC-X.690>.

### 11.2. Informative References

[CMP2018]
  Castelnovi, L., Martinelli, A., and T. Prest, "Grafting Trees: A Fault Attack Against the SPHINCS Framework", Post-Quantum Cryptography (PQCrpyto 2018), Lecture Notes in Computer Science, vol. 10786, pp. 165-184, 2018, <https://link.springer.com/chapter/10.1007/978-3-319-79063-3_8>.
[FIPS180]
  NIST, "Secure Hash Standard (SHS)", NIST FIPS 180-4, DOI 10.6028/NIST.FIPS.180-4, August 2015, <https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf>.
[FIPS202]
  NIST, "SHA-3 Standard: Permutation-Based Hash and Extendable-Output Functions", NIST FIPS 202, DOI 10.6028/NIST.FIPS.202, August 2015, <http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf>.
[Ge2023]
  Genêt, A., "On Protecting SPHINCS+ Against Fault Attacks", TCHES, vol. 2023, no. 2, pp. 80-114, DOI 10.46586/tches.v2023.i2.80-114, March 2023, <https://doi.org/10.46586/tches.v2023.i2.80-114>.
[NIST-PQC]
  NIST, "Post-Quantum Cryptography (PQC)", 28 July 2025, <https://csrc.nist.gov/projects/post-quantum-cryptography>.
[RFC7468]
  Josefsson, S. and S. Leonard, "Textual Encodings of PKIX, PKCS, and CMS Structures", RFC 7468, DOI 10.17487/RFC7468, April 2015, <https://www.rfc-editor.org/info/rfc7468>.
[RFC8410]
  Josefsson, S. and J. Schaad, "Algorithm Identifiers for Ed25519, Ed448, X25519, and X448 for Use in the Internet X.509 Public Key Infrastructure", RFC 8410, DOI 10.17487/RFC8410, August 2018, <https://www.rfc-editor.org/info/rfc8410>.
[RFC8411]
  Schaad, J. and R. Andrews, "IANA Registration for the Cryptographic Algorithm Object Identifier Range", RFC 8411, DOI 10.17487/RFC8411, August 2018, <https://www.rfc-editor.org/info/rfc8411>.
[RFC9881]
  Massimo, J., Kampanakis, P., Turner, S., and B. E. Westerbaan, "Internet X.509 Public Key Infrastructure -- Algorithm Identifiers for the Module-Lattice-Based Digital Signature Algorithm (ML-DSA)", RFC 9881, DOI 10.17487/RFC9881, October 2025, <https://www.rfc-editor.org/info/rfc9881>.
[SLotH]
  Saarinen, M-J., "Accelerating SLH-DSA by Two Orders of Magnitude with a Single Hash Unit", Cryptology ePrint Archive, Paper 2024/367, DOI 10.1007/978-3-031-68376-3_9, 2024, <https://eprint.iacr.org/2024/367.pdf>.

## Appendix A. ASN.1 Module

This appendix includes the ASN.1 module [X680] for SLH-DSA. Note that as per [RFC5280], certificates use the Distinguished Encoding Rules; see [X690]. This module imports objects from [RFC5912] and [RFC9814].¶

    <CODE BEGINS>
    X509-SLH-DSA-Module-2025
      { iso(1) identified-organization(3) dod(6) internet(1) security(5)
        mechanisms(5) pkix(7) id-mod(0) id-mod-x509-slh-dsa-2025(120) }

    DEFINITIONS IMPLICIT TAGS ::= BEGIN

    EXPORTS ALL;

    IMPORTS
      PUBLIC-KEY, SIGNATURE-ALGORITHM, SMIME-CAPS
        FROM AlgorithmInformation-2009  -- in [RFC5912]
        { iso(1) identified-organization(3) dod(6) internet(1)
          security(5) mechanisms(5) pkix(7) id-mod(0)
          id-mod-algorithmInformation-02(58) }

      pk-slh-dsa-sha2-128s, pk-slh-dsa-sha2-128f,
      pk-slh-dsa-sha2-192s, pk-slh-dsa-sha2-192f,
      pk-slh-dsa-sha2-256s, pk-slh-dsa-sha2-256f,
      pk-slh-dsa-shake-128s, pk-slh-dsa-shake-128f,
      pk-slh-dsa-shake-192s, pk-slh-dsa-shake-192f,
      pk-slh-dsa-shake-256s, pk-slh-dsa-shake-256f,
      sa-slh-dsa-sha2-128s, sa-slh-dsa-sha2-128f,
      sa-slh-dsa-sha2-192s, sa-slh-dsa-sha2-192f,
      sa-slh-dsa-sha2-256s, sa-slh-dsa-sha2-256f,
      sa-slh-dsa-shake-128s, sa-slh-dsa-shake-128f,
      sa-slh-dsa-shake-192s, sa-slh-dsa-shake-192f,
      sa-slh-dsa-shake-256s, sa-slh-dsa-shake-256f
        FROM SLH-DSA-Module-2024  -- in [RFC9814]
        { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs9(9)
          id-smime(16) id-mod(0) id-mod-slh-dsa-2024(81) } ;

    --
    -- HashSLH-DSA object identifiers from [CSOR]
    --

    nistAlgorithms OBJECT IDENTIFIER ::= { joint-iso-itu-t(2)
      country(16) us(840) organization(1) gov(101) csor(3) 4 }

    sigAlgs OBJECT IDENTIFIER ::= { nistAlgorithms 3 }

    id-hash-slh-dsa-sha2-128s-with-sha256 OBJECT IDENTIFIER ::= {
      sigAlgs 35 }

    id-hash-slh-dsa-sha2-128f-with-sha256 OBJECT IDENTIFIER ::= {
      sigAlgs 36 }

    id-hash-slh-dsa-sha2-192s-with-sha512 OBJECT IDENTIFIER ::= {
      sigAlgs 37 }

    id-hash-slh-dsa-sha2-192f-with-sha512 OBJECT IDENTIFIER ::= {
      sigAlgs 38 }

    id-hash-slh-dsa-sha2-256s-with-sha512 OBJECT IDENTIFIER ::= {
      sigAlgs 39 }

    id-hash-slh-dsa-sha2-256f-with-sha512 OBJECT IDENTIFIER ::= {
      sigAlgs 40 }

    id-hash-slh-dsa-shake-128s-with-shake128 OBJECT IDENTIFIER ::= {
      sigAlgs 41 }

    id-hash-slh-dsa-shake-128f-with-shake128 OBJECT IDENTIFIER ::= {
      sigAlgs 42 }

    id-hash-slh-dsa-shake-192s-with-shake256 OBJECT IDENTIFIER ::= {
      sigAlgs 43 }

    id-hash-slh-dsa-shake-192f-with-shake256 OBJECT IDENTIFIER ::= {
      sigAlgs 44 }

    id-hash-slh-dsa-shake-256s-with-shake256 OBJECT IDENTIFIER ::= {
      sigAlgs 45 }

    id-hash-slh-dsa-shake-256f-with-shake256 OBJECT IDENTIFIER ::= {
      sigAlgs 46 }

    --
    -- HashSLH-DSA public key identifiers
    --

    pk-hash-slh-dsa-sha2-128s-with-sha256 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-128s-with-sha256
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-sha2-128f-with-sha256 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-128f-with-sha256
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-sha2-192s-with-sha512 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-192s-with-sha512
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-sha2-192f-with-sha512 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-192f-with-sha512
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-sha2-256s-with-sha512 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-256s-with-sha512
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-sha2-256f-with-sha512 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-256f-with-sha512
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-shake-128s-with-shake128 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-shake-128s-with-shake128
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-shake-128f-with-shake128 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-shake-128f-with-shake128
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-shake-192s-with-shake256 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-shake-192s-with-shake256
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-shake-192f-with-shake256 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-shake-192f-with-shake256
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-shake-256s-with-shake256 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-shake-256s-with-shake256
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    pk-hash-slh-dsa-shake-256f-with-shake256 PUBLIC-KEY ::= {
      IDENTIFIER id-hash-slh-dsa-shake-256f-with-shake256
      -- KEY no ASN.1 wrapping --
      CERT-KEY-USAGE
          { digitalSignature, nonRepudiation, keyCertSign, cRLSign }
      -- PRIVATE-KEY no ASN.1 wrapping -- }

    --
    -- HashSLH-DSA signature algorithm identifiers
    --

    sa-hash-slh-dsa-sha2-128s-with-sha256 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-128s-with-sha256
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-sha2-128s-with-sha256 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-sha2-128s-with-sha256 } }

    sa-hash-slh-dsa-sha2-128f-with-sha256 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-128f-with-sha256
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-sha2-128f-with-sha256 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-sha2-128f-with-sha256 } }

    sa-hash-slh-dsa-sha2-192s-with-sha512 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-192s-with-sha512
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-sha2-192s-with-sha512 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-sha2-192s-with-sha512 } }

    sa-hash-slh-dsa-sha2-192f-with-sha512 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-192f-with-sha512
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-sha2-192f-with-sha512 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-sha2-192f-with-sha512 } }

    sa-hash-slh-dsa-sha2-256s-with-sha512 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-256s-with-sha512
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-sha2-256s-with-sha512 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-sha2-256s-with-sha512 } }

    sa-hash-slh-dsa-sha2-256f-with-sha512 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-sha2-256f-with-sha512
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-sha2-256f-with-sha512 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-sha2-256f-with-sha512 } }

    sa-hash-slh-dsa-shake-128s-with-shake128 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-shake-128s-with-shake128
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-shake-128s-with-shake128 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-shake-128s-with-shake128 } }

    sa-hash-slh-dsa-shake-128f-with-shake128 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-shake-128f-with-shake128
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-shake-128f-with-shake128 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-shake-128f-with-shake128 } }

    sa-hash-slh-dsa-shake-192s-with-shake256 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-shake-192s-with-shake256
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-shake-192s-with-shake256 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-shake-192s-with-shake256 } }

    sa-hash-slh-dsa-shake-192f-with-shake256 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-shake-192f-with-shake256
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-shake-192f-with-shake256 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-shake-192f-with-shake256 } }

    sa-hash-slh-dsa-shake-256s-with-shake256 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-shake-256s-with-shake256
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-shake-256s-with-shake256 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-shake-256s-with-shake256 } }

    sa-hash-slh-dsa-shake-256f-with-shake256 SIGNATURE-ALGORITHM ::= {
      IDENTIFIER id-hash-slh-dsa-shake-256f-with-shake256
      PARAMS ARE absent
      PUBLIC-KEYS { pk-hash-slh-dsa-shake-256f-with-shake256 }
      SMIME-CAPS {
        IDENTIFIED BY id-hash-slh-dsa-shake-256f-with-shake256 } }

    --
    -- Expand SignatureAlgorithms from RFC 5912
    --
    SignatureAlgorithms SIGNATURE-ALGORITHM ::= {
      sa-slh-dsa-sha2-128s |
      sa-slh-dsa-sha2-128f |
      sa-slh-dsa-sha2-192s |
      sa-slh-dsa-sha2-192f |
      sa-slh-dsa-sha2-256s |
      sa-slh-dsa-sha2-256f |
      sa-slh-dsa-shake-128s |
      sa-slh-dsa-shake-128f |
      sa-slh-dsa-shake-192s |
      sa-slh-dsa-shake-192f |
      sa-slh-dsa-shake-256s |
      sa-slh-dsa-shake-256f |
      sa-hash-slh-dsa-sha2-128s-with-sha256 |
      sa-hash-slh-dsa-sha2-128f-with-sha256 |
      sa-hash-slh-dsa-sha2-192s-with-sha512 |
      sa-hash-slh-dsa-sha2-192f-with-sha512 |
      sa-hash-slh-dsa-sha2-256s-with-sha512 |
      sa-hash-slh-dsa-sha2-256f-with-sha512 |
      sa-hash-slh-dsa-shake-128s-with-shake128 |
      sa-hash-slh-dsa-shake-128f-with-shake128 |
      sa-hash-slh-dsa-shake-192s-with-shake256 |
      sa-hash-slh-dsa-shake-192f-with-shake256 |
      sa-hash-slh-dsa-shake-256s-with-shake256 |
      sa-hash-slh-dsa-shake-256f-with-shake256,
      ... }

    SMimeCaps SMIME-CAPS ::= {
      sa-slh-dsa-sha2-128s.&smimeCaps |
      sa-slh-dsa-sha2-128f.&smimeCaps |
      sa-slh-dsa-sha2-192s.&smimeCaps |
      sa-slh-dsa-sha2-192f.&smimeCaps |
      sa-slh-dsa-sha2-256s.&smimeCaps |
      sa-slh-dsa-sha2-256f.&smimeCaps |
      sa-slh-dsa-shake-128s.&smimeCaps |
      sa-slh-dsa-shake-128f.&smimeCaps |
      sa-slh-dsa-shake-192s.&smimeCaps |
      sa-slh-dsa-shake-192f.&smimeCaps |
      sa-slh-dsa-shake-256s.&smimeCaps |
      sa-slh-dsa-shake-256f.&smimeCaps |
      sa-hash-slh-dsa-sha2-128s-with-sha256.&smimeCaps |
      sa-hash-slh-dsa-sha2-128f-with-sha256.&smimeCaps |
      sa-hash-slh-dsa-sha2-192s-with-sha512.&smimeCaps |
      sa-hash-slh-dsa-sha2-192f-with-sha512.&smimeCaps |
      sa-hash-slh-dsa-sha2-256s-with-sha512.&smimeCaps |
      sa-hash-slh-dsa-sha2-256f-with-sha512.&smimeCaps |
      sa-hash-slh-dsa-shake-128s-with-shake128.&smimeCaps |
      sa-hash-slh-dsa-shake-128f-with-shake128.&smimeCaps |
      sa-hash-slh-dsa-shake-192s-with-shake256.&smimeCaps |
      sa-hash-slh-dsa-shake-192f-with-shake256.&smimeCaps |
      sa-hash-slh-dsa-shake-256s-with-shake256.&smimeCaps |
      sa-hash-slh-dsa-shake-256f-with-shake256.&smimeCaps,
      ... }

    --
    -- Expand PublicKeyAlgorithms from RFC 5912
    --
    PublicKeyAlgorithms PUBLIC-KEY ::= {
      pk-slh-dsa-sha2-128s |
      pk-slh-dsa-sha2-128f |
      pk-slh-dsa-sha2-192s |
      pk-slh-dsa-sha2-192f |
      pk-slh-dsa-sha2-256s |
      pk-slh-dsa-sha2-256f |
      pk-slh-dsa-shake-128s |
      pk-slh-dsa-shake-128f |
      pk-slh-dsa-shake-192s |
      pk-slh-dsa-shake-192f |
      pk-slh-dsa-shake-256s |
      pk-slh-dsa-shake-256f |
      pk-hash-slh-dsa-sha2-128s-with-sha256 |
      pk-hash-slh-dsa-sha2-128f-with-sha256 |
      pk-hash-slh-dsa-sha2-192s-with-sha512 |
      pk-hash-slh-dsa-sha2-192f-with-sha512 |
      pk-hash-slh-dsa-sha2-256s-with-sha512 |
      pk-hash-slh-dsa-sha2-256f-with-sha512 |
      pk-hash-slh-dsa-shake-128s-with-shake128 |
      pk-hash-slh-dsa-shake-128f-with-shake128 |
      pk-hash-slh-dsa-shake-192s-with-shake256 |
      pk-hash-slh-dsa-shake-192f-with-shake256 |
      pk-hash-slh-dsa-shake-256s-with-shake256 |
      pk-hash-slh-dsa-shake-256f-with-shake256,
       ... }

    END

    <CODE ENDS>

¶

## Appendix B. Security Strengths

Instead of defining the strength of a quantum algorithm using the number of bits of security, NIST defined a collection of broad security strength categories. Each category is defined by a comparatively easy-to-analyze reference primitive that covers a range of security strengths offered by existing NIST standards in symmetric cryptography, which NIST expects to offer significant resistance to quantum cryptanalysis. These categories describe any attack that breaks the relevant security definition that must require computational resources comparable to or greater than those required for:¶

- Level 1 - key search on a block cipher with a 128-bit key (e.g., AES128),¶
- Level 2 - collision search on a 256-bit hash function (e.g., SHA256/ SHA3-256),¶
- Level 3 - key search on a block cipher with a 192-bit key (e.g., AES192),¶
- Level 4 - collision search on a 384-bit hash function (e.g., SHA384/SHA3-384), and¶
- Level 5 - key search on a block cipher with a 256-bit key (e.g., AES 256).¶

The SLH-DSA parameter sets defined for NIST security levels 1, 3, and 5 are listed in Table 1, along with the resulting signature, public key, and private key sizes in bytes. The HashSLH-DSA parameter sets have the same values as the Pure SLH-DSA equivalents.¶

Table 1: SLH-DSA Security Strengths
OID | NIST Level | Size (in bytes)
--- | --- | ---
Sig. | Pub. Key | Priv. Key
id-(hash-)slh-dsa-sha2-128s | 1 | 7856 | 32 | 64
id-(hash-)slh-dsa-sha2-128f | 1 | 17088 | 32 | 64
id-(hash-)slh-dsa-sha2-192s | 3 | 16224 | 48 | 96
id-(hash-)slh-dsa-sha2-192f | 3 | 35664 | 48 | 96
id-(hash-)slh-dsa-sha2-256s | 5 | 29792 | 64 | 128
id-(hash-)slh-dsa-sha2-256f | 5 | 49856 | 64 | 128
id-(hash-)slh-dsa-shake-128s | 1 | 7856 | 32 | 64
id-(hash-)slh-dsa-shake-128f | 1 | 17088 | 32 | 64
id-(hash-)slh-dsa-shake-192s | 3 | 16224 | 48 | 96
id-(hash-)slh-dsa-shake-192f | 3 | 35664 | 48 | 96
id-(hash-)slh-dsa-shake-256s | 5 | 29792 | 64 | 128
id-(hash-)slh-dsa-shake-256f | 5 | 49856 | 64 | 128

## Appendix C. Examples

This appendix contains examples of SLH-DSA public keys, private keys, and certificates.¶

### C.1. Example Public Key

An example of an SLH-DSA public key using id-slh-dsa-sha2-128s:¶

    -----BEGIN PUBLIC KEY-----
    MDAwCwYJYIZIAWUDBAMUAyEAK4EJ7Hd8qk4fAkzPz5SX2ZGAUJKA9CVq8rB6+AKJ
    tJQ=
    -----END PUBLIC KEY-----

¶

      0  48: SEQUENCE {
      2  11:   SEQUENCE {
      4   9:     OBJECT IDENTIFIER '2 16 840 1 101 3 4 3 20'
           :     }
     15  33:   BIT STRING
           :     2B 81 09 EC 77 7C AA 4E 1F 02 4C CF CF 94 97 D9
           :     91 80 50 92 80 F4 25 6A F2 B0 7A F8 02 89 B4 94
           :   }

¶

### C.2. Example Private Key

An example of an SLH-DSA private key without the public key using id-slh-dsa-sha2-128s:¶

    -----BEGIN PRIVATE KEY-----
    MFICAQAwCwYJYIZIAWUDBAMUBECiJjvKRYYINlIxYASVI9YhZ3+tkNUetgZ6Mn4N
    HmSlASuBCex3fKpOHwJMz8+Ul9mRgFCSgPQlavKwevgCibSU
    -----END PRIVATE KEY-----

¶

      0  82: SEQUENCE {
      2   1:   INTEGER 0
      5  11:   SEQUENCE {
      7   9:     OBJECT IDENTIFIER '2 16 840 1 101 3 4 3 20'
           :     }
     18  64:   OCTET STRING
           :     A2 26 3B CA 45 86 08 36 52 31 60 04 95 23 D6 21
           :     67 7F AD 90 D5 1E B6 06 7A 32 7E 0D 1E 64 A5 01
           :     2B 81 09 EC 77 7C AA 4E 1F 02 4C CF CF 94 97 D9
           :     91 80 50 92 80 F4 25 6A F2 B0 7A F8 02 89 B4 94
           :   }

¶

### C.3. Example Certificate

An example of a self-signed SLH-DSA certificate using id-slh-dsa-sha2-128s:¶

    Certificate:
        Data:
            Version: 3 (0x2)
            Serial Number:
                43:85:63:a2:69:01:99:2c:39:cf:bc:40:57:1b:5f:a3:
                cc:c7:88:45
            Signature Algorithm: slhdsa_sha2_128s
            Issuer: C=FR, L=Paris, O=Bogus SLH-DSA-SHA2-128s CA
            Validity
                Not Before: Oct 16 13:42:12 2024 GMT
                Not After : Oct 14 13:42:12 2034 GMT
            Subject: C=FR, L=Paris, O=Bogus SLH-DSA-SHA2-128s CA
            Subject Public Key Info:
                Public Key Algorithm: slhdsa_sha2_128s
                    slhdsa_sha2_128s public key:
                    PQ key material:
                        2b:81:09:ec:77:7c:aa:4e:1f:02:4c:cf:cf:94:97:
                        d9:91:80:50:92:80:f4:25:6a:f2:b0:7a:f8:02:89:
                        b4:94
            X509v3 extensions:
                X509v3 Subject Key Identifier:
                    CD:59:36:AA:FE:C4:11:C7:A4:72:69:3F:0B:E8:B3:8B:
                    21:7B:19:ED
                X509v3 Authority Key Identifier:
                    CD:59:36:AA:FE:C4:11:C7:A4:72:69:3F:0B:E8:B3:8B:
                    21:7B:19:ED
                X509v3 Basic Constraints: critical
                    CA:TRUE
                X509v3 Key Usage: critical
                    Certificate Sign, CRL Sign
        Signature Algorithm: slhdsa_sha2_128s
        Signature Value:
            aa:a0:51:de:b0:c3:14:d0:cd:fb:12:46:a2:31:20:c9:ed:ab:
            3f:dc:57:a5:fb:45:f6:f0:3b:7f:e3:5a:8c:b5:87:1e:1f:0b:
            15:9f:aa:56:68:43:7e:ea:23:05:21:d1:33:cb:84:61:55:7e:
            39:74:18:3c:ea:8e:01:a4:8d:9a:fb:35:74:69:c9:62:35:7f:
            0e:34:01:1c:90:41:97:13:ff:c5:a4:65:ae:0f:bf:9b:32:d2:
            2a:2c:97:86:2d:49:eb:ba:ae:9a:70:e7:35:67:3f:0a:7e:3a:
            dd:0b:66:4e:f8:45:b2:e6:d8:70:ab:fb:72:60:eb:85:ae:62:
            3c:a4:bf:3c:7a:e5:dd:4a:24:e2:4e:d0:b5:3b:c3:ac:e9:26:
            f8:6c:ca:3b:e1:46:15:7f:18:c5:41:40:90:73:b9:19:63:86:
            23:3a:b2:7f:12:3a:5f:bb:c3:10:6c:4e:b2:62:ee:3b:4b:c5:
            e2:69:24:74:3e:6e:81:e2:68:48:c8:27:25:bc:b2:ac:da:a8:
            ae:75:5a:5c:09:22:1c:be:95:0a:0b:5e:0c:08:49:42:3a:0d:
            2d:fb:89:3b:b3:15:de:ee:e7:b2:5e:1f:a6:f0:4a:f6:65:c1:
            5d:5e:05:7a:6d:2a:e7:c2:c3:20:37:ce:ab:0f:6c:ea:c9:39:
            f3:28:d1:75:81:31:7f:01:e2:09:c8:56:81:50:cf:4e:fa:82:
            1a:60:3e:87:bf:61:ca:a0:40:27:95:bf:f8:4f:04:b1:fd:1f:
            7f:ce:29:fa:15:5c:ef:94:9a:f6:f0:0c:7f:09:7f:ec:b6:36:
            26:83:69:aa:2d:69:9e:17:7a:15:aa:9b:51:43:c1:90:7c:c9:
            69:3a:5a:b1:ee:77:c9:28:e7:21:d8:93:0a:80:19:9c:5e:b7:
            61:5f:14:6c:9a:00:22:aa:4d:b8:86:03:b5:83:4a:e9:f3:5a:
            76:cc:a3:3b:e4:13:94:f7:56:96:56:33:dd:19:d9:3d:8d:55:
            ab:99:e5:00:24:f7:ff:f4:ee:08:47:8d:43:b3:f4:e3:3a:d5:
            12:ef:04:00:99:62:a1:5e:cd:5f:9f:90:f3:c2:8e:35:9b:8a:
            46:ec:54:4e:13:20:59:5f:63:d9:61:b1:e2:c4:36:d2:e5:27:
            56:1f:53:59:9c:24:ec:6a:79:2b:1d:6a:f2:93:38:d8:eb:7a:
            cd:d7:8a:c8:98:d4:87:61:bf:79:3c:2a:64:42:0f:5b:15:b4:
            bd:c0:c7:c4:de:20:4c:bb:d8:0f:61:2e:aa:67:e1:a7:ff:0d:
            b7:dd:05:cf:5c:cb:0c:46:26:e0:d9:48:cb:45:76:27:88:51:
            49:df:4c:16:65:8c:1a:84:82:09:f3:d4:ee:c4:2a:17:a9:7b:
            c0:77:24:fd:4f:00:98:12:ed:10:e7:67:c3:7d:54:78:0f:c8:
            67:7f:f4:f2:80:2b:1b:34:0c:fa:5f:c4:12:85:1c:5f:e6:84:
            8d:ce:12:e7:ae:f5:ef:eb:96:5f:62:6f:87:3a:35:67:ca:d8:
            ad:b5:55:0b:0d:06:91:d3:9d:1a:96:2e:67:d8:b1:0e:8f:07:
            3f:7b:d6:fe:b5:76:62:19:83:f6:d2:08:35:3b:9f:1d:0a:f7:
            14:d2:45:50:70:5c:91:cc:b5:0f:4b:ef:79:ef:d3:c7:bd:02:
            7a:fa:8b:83:cd:31:07:b0:f7:8a:79:c4:68:19:de:01:f8:73:
            1a:6d:8a:c7:54:c8:4b:9a:40:53:e3:4b:e4:bd:3a:52:50:c6:
            de:de:19:d7:9e:a8:88:70:f1:70:a6:11:55:b0:46:5e:40:37:
            b2:90:5c:91:76:bd:20:1d:24:db:71:33:81:b8:47:ef:ec:7e:
            78:d2:25:2b:4b:e2:6e:01:81:d4:12:ff:40:ff:e0:d7:90:29:
            85:80:e6:4a:f5:5b:32:6c:b7:05:1c:20:27:e0:98:57:80:e7:
            a2:97:cb:91:ce:d9:c1:a3:5f:dc:24:7f:b8:f5:5c:da:91:83:
            e5:ae:8c:65:73:84:6a:5b:c9:3f:97:51:7d:cc:3f:d6:39:e1:
            71:f1:54:8d:1f:4f:33:70:cc:07:f8:03:70:be:8c:81:e1:5d:
            73:c1:9c:be:7c:3d:69:c0:cc:72:90:cf:65:38:35:71:16:ae:
            1d:e2:a6:08:c8:7b:dd:c0:30:f4:b4:2a:45:fc:05:e6:1c:ef:
            af:f3:53:03:2f:76:b5:7b:f1:a9:7d:16:33:b1:b5:c2:4f:9b:
            55:7b:0d:22:f6:08:4b:38:b2:67:4e:d9:f8:f1:65:03:d6:5a:
            1f:1f:8b:cb:da:78:fc:7b:52:a5:d7:1b:35:b2:cd:06:7e:1e:
            1d:8b:60:40:91:74:2f:91:c9:c6:c7:c4:01:f5:2f:10:c2:ea:
            ab:84:f6:f6:2e:fc:77:c1:85:28:90:a5:11:dc:ed:07:78:c2:
            74:9c:60:86:69:40:3c:17:9b:3a:e5:e8:65:22:c2:7f:d9:88:
            be:43:6a:31:90:d5:23:37:eb:93:70:e4:bc:34:94:4f:af:a4:
            c1:6f:f3:30:1b:c6:e1:f5:f1:d8:7b:a4:4e:6e:69:be:82:d0:
            80:a8:ae:99:44:e1:d6:fa:45:e5:05:a5:52:0a:5d:60:17:3a:
            1e:2e:dd:2e:b4:86:93:31:93:0f:ca:5f:05:52:8e:31:15:e8:
            8b:30:88:33:d7:da:91:52:40:3c:d7:18:bc:72:8d:88:b2:65:
            c5:fe:0a:7c:50:44:7e:0f:b6:52:53:8b:28:fc:5b:fa:93:54:
            36:ca:e1:c1:6b:7f:46:13:de:05:7d:be:33:8d:67:52:ba:6d:
            af:4b:ee:01:0b:c7:56:21:7d:16:bd:19:83:90:c8:14:51:8b:
            fb:83:c1:a5:ca:69:5a:ae:d9:f1:a7:dc:f7:53:9f:f6:a3:43:
            94:fb:38:86:1f:2a:0f:50:cf:8d:bc:36:51:ce:8e:af:80:fe:
            b5:80:f8:43:73:ea:3a:d7:a2:a4:b6:73:3a:5a:6b:48:a7:31:
            a3:d3:42:3a:fc:2e:b0:29:d2:67:8a:9a:d1:26:95:08:0b:61:
            3f:71:ee:b1:96:f4:49:0c:d7:3b:50:61:6c:15:ca:31:31:dc:
            0d:fc:d8:5f:a1:26:d3:e2:43:cd:13:39:4a:50:2d:64:57:bf:
            02:a8:5c:54:4a:d4:37:45:f2:09:fd:cf:53:67:19:e9:92:a4:
            cd:1b:82:09:2c:4d:29:30:80:c1:23:8b:ca:1c:38:c6:11:8f:
            a2:3c:2c:7f:86:25:c9:fe:a3:1a:fc:82:ab:69:e9:b5:37:b1:
            0e:9a:99:10:cd:a7:b6:52:9f:c6:e4:6e:08:f1:90:cd:14:b8:
            c2:e0:a9:58:2e:8a:4c:52:df:d5:ee:8a:57:ce:82:57:a6:89:
            0f:74:20:4c:22:1d:02:c9:04:52:68:78:f3:59:c9:c3:60:85:
            92:01:30:75:a0:eb:29:2b:66:55:b7:48:4a:df:8f:ba:df:a8:
            bc:d9:45:5c:eb:04:a8:c3:94:b6:bb:1d:05:19:48:9b:ae:8d:
            63:2d:ba:d6:d3:5e:e5:7a:40:b6:05:74:a1:b0:7a:b7:d7:b4:
            67:d6:d6:ac:f5:05:6f:53:45:a6:ed:e0:0c:b3:0c:32:c6:89:
            fb:42:7b:11:74:94:25:dc:01:7c:bb:4e:4f:4f:97:54:28:b0:
            fb:48:66:87:3a:d0:da:18:bf:aa:13:0c:6a:d3:c7:3e:11:26:
            43:e8:40:b3:57:29:00:70:00:af:58:b0:75:83:9e:b9:4b:5b:
            39:f1:7f:3f:89:8d:1d:0b:1a:78:4d:e5:8c:e6:07:86:75:23:
            1b:14:1f:cd:04:4d:98:d1:cd:f5:4f:1d:00:55:fb:f8:c7:92:
            f5:ee:5e:c5:f3:24:84:22:ee:11:48:91:4b:51:f7:87:a8:9c:
            a0:9a:48:bc:93:f5:3c:1c:7e:d9:ac:15:1c:1f:b7:f9:b9:66:
            9f:f4:e5:58:4a:f9:7e:5c:3f:a3:5a:20:54:be:57:74:74:65:
            80:0d:f4:30:a9:0d:53:e6:71:52:f9:7e:f4:02:24:e5:b4:21:
            0b:bc:13:2e:67:00:bd:64:54:8b:82:b4:64:f8:52:46:b2:f2:
            37:5d:32:49:8a:be:19:4e:21:a7:cc:9a:19:29:c9:57:aa:fe:
            db:4a:ef:e0:a1:06:1a:5f:58:4c:97:ae:fe:ac:16:a0:e3:a7:
            60:ef:b6:bf:80:67:35:c8:6c:fe:11:16:18:bd:04:90:32:b6:
            75:64:13:55:b2:2e:c6:df:2f:b7:35:d6:3c:f1:ab:4c:1e:da:
            c2:4f:fc:24:f2:92:ce:64:dd:ef:70:7a:ae:26:07:01:61:9f:
            e6:2e:fe:e4:35:8c:d5:ee:e2:be:fd:3b:8f:c4:dc:5c:50:4c:
            5a:2e:aa:14:c4:0e:b5:81:13:55:d0:85:81:16:3d:ce:03:f0:
            2b:25:39:b6:f9:ce:ff:c0:f5:4d:77:60:86:03:25:ff:dd:57:
            cb:fd:28:fd:e2:8e:bb:7c:fb:49:46:9c:2c:0e:34:74:cf:d2:
            b8:45:be:fd:c1:2a:6b:8e:30:48:c3:a7:41:67:04:78:68:9d:
            81:1c:35:f4:93:5a:1f:47:ab:3a:34:5e:4e:2d:43:2b:f4:52:
            bc:58:34:52:15:53:36:19:c9:b0:bc:57:7c:95:b3:86:ee:7e:
            68:9f:73:b2:09:30:4f:f8:90:ae:0b:8d:f4:f4:d1:47:1b:e8:
            d1:03:85:92:2d:8a:60:ab:30:f3:ea:26:5e:37:e9:90:b6:2d:
            f6:08:1f:bc:fd:13:5a:fd:a9:29:7c:ab:58:10:d9:6d:3b:27:
            75:31:f4:74:a8:e8:70:00:a3:63:f1:8c:b4:97:22:2b:d0:f8:
            e0:b2:6e:4f:4a:96:d5:f0:3d:fe:73:e1:c8:ba:fb:a8:96:bf:
            01:c2:63:70:fa:dd:97:e5:c9:8f:00:04:5d:fa:c0:39:68:ba:
            e5:dc:aa:7b:3d:bd:25:aa:43:e2:02:a1:57:2b:78:74:80:f8:
            d6:ea:a2:44:7f:1e:35:46:cb:7d:2f:83:dc:7a:25:87:e0:27:
            ce:df:12:15:83:b6:26:2a:f9:4e:22:18:ca:69:7d:e3:68:86:
            08:40:fa:45:1b:a5:3d:63:a1:aa:19:ca:83:3d:2e:4b:13:4d:
            58:26:62:f2:ef:3c:6b:13:cc:99:95:21:c2:c7:f5:af:08:ef:
            a0:21:1a:4b:e9:f4:1c:4d:46:72:88:22:8b:aa:b5:dc:fe:3b:
            e6:8d:b9:51:8d:45:f4:70:13:68:a2:2b:0a:9c:82:16:64:fc:
            3a:5a:2a:19:a6:fe:92:34:65:e2:6a:9c:a5:93:24:21:b4:b6:
            50:b8:04:31:02:1c:df:4f:b8:9c:b6:3b:19:66:26:aa:c0:33:
            fd:9b:fb:02:2f:c8:07:8c:1f:66:8a:f6:f3:c5:0b:74:ce:75:
            c4:94:34:80:60:53:c1:42:09:2d:21:fb:25:b4:ff:c1:00:30:
            f1:c8:ad:ce:62:c6:1d:d7:94:cc:0f:7b:2a:00:be:b3:f3:c8:
            3f:e5:88:af:6d:19:90:31:71:96:d6:8c:5b:34:b8:85:b5:42:
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¶

## Acknowledgments

Much of the structure and text of this document is based on [RFC8410] and [RFC9881]. The remainder comes from [RFC9814]. Thanks to the authors of those documents, and the ones they based their work on, for making our work easier. "Copying always makes things easier and less error prone" [RFC8411]. Thanks to Sean Turner for helpful text and to Markku-Juhani O. Saarinen for side-channel clarifications.¶

## Authors' Addresses