CBOR Object Signing and Encryption                            M. Prorock
Internet-Draft                                                  mesur.io
Intended status: Standards Track                               O. Steele
Expires: 6 October 2026                                     Tradeverifyd
                                                           H. Tschofenig
                                                                UniBw M.
                                                            4 April 2026


                       SLH-DSA for JOSE and COSE
                  draft-ietf-cose-sphincs-plus-latest

Abstract

   This document specifies JSON Object Signing and Encryption (JOSE) and
   CBOR Object Signing and Encryption (COSE) serializations for
   Stateless Hash-Based Digital Signature Standard (SLH-DSA), a Post-
   Quantum Cryptography (PQC) digital signature scheme defined in US
   NIST FIPS 205.

About This Document

   This note is to be removed before publishing as an RFC.

   The latest revision of this draft can be found at https://cose-
   wg.github.io/draft-ietf-cose-sphincs-plus/draft-ietf-cose-sphincs-
   plus.html.  Status information for this document may be found at
   https://datatracker.ietf.org/doc/draft-ietf-cose-sphincs-plus/.

   Discussion of this document takes place on the CBOR Object Signing
   and Encryption Working Group mailing list (mailto:cose@ietf.org),
   which is archived at https://mailarchive.ietf.org/arch/browse/cose/.
   Subscribe at https://www.ietf.org/mailman/listinfo/cose/.

   Source for this draft and an issue tracker can be found at
   https://github.com/cose-wg/draft-ietf-cose-sphincs-plus.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on 6 October 2026.

Copyright Notice

   Copyright (c) 2026 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction
   2.  Terminology
   3.  The SLH-DSA Algorithm Family
   4.  SLH-DSA Keys
   5.  Security Considerations
     5.1.  Pre-Hash and Hashing Considerations
     5.2.  Validating Public Keys
     5.3.  Side-Channel Attacks
     5.4.  Randomness considerations
   6.  IANA Considerations
     6.1.  New COSE Algorithms
       6.1.1.  SLH-DSA-SHA2-128s
       6.1.2.  SLH-DSA-SHAKE-128s
       6.1.3.  SLH-DSA-SHA2-128f
     6.2.  New JOSE Algorithms
       6.2.1.  SLH-DSA-SHA2-128s
       6.2.2.  SLH-DSA-SHAKE-128s
       6.2.3.  SLH-DSA-SHA2-128f
   7.  References
     7.1.  Normative References
     7.2.  Informative References
   Appendix A.  Examples
     A.1.  JOSE
       A.1.1.  SLH-DSA-SHA2-128s
       A.1.2.  SLH-DSA-SHAKE-128s
       A.1.3.  SLH-DSA-SHA2-128f
     A.2.  COSE
       A.2.1.  SLH-DSA-SHA2-128s
       A.2.2.  SLH-DSA-SHAKE-128s
       A.2.3.  SLH-DSA-SHA2-128f
   Acknowledgments
   Contributors
   Authors' Addresses

1.  Introduction

   This document specifies JSON Object Signing and Encryption (JOSE)
   [RFC7515] and CBOR Object Signing and Encryption (COSE) [RFC9052]
   serializations for the Stateless Hash-Based Digital Signature
   Standard (SLH-DSA), which was derived from Version 3.1 of SPHINCS+, a
   Post-Quantum Cryptography (PQC) based digital signature scheme
   standardized in [FIPS-205].

   This document builds on the Algorithm Key Pair (AKP) type, as defined
   in [I-D.ietf-cose-dilithium].  The AKP type enables flexible
   representation of keys used across different post-quantum
   cryptographic algorithms, including SLH-DSA.

2.  Terminology

   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.  The SLH-DSA Algorithm Family

   The SLH-DSA Signature Scheme is parameterized to support different
   security levels.

   This document introduces the registration of the following algorithms
   in [IANA.jose]:

   +====================+====================+====================+
   | Name               | alg                | Description        |
   +====================+====================+====================+
   | SLH-DSA-SHA2-128s  | SLH-DSA-SHA2-128s  | JSON Web Signature |
   |                    |                    | Algorithm for SLH- |
   |                    |                    | DSA-SHA2-128s      |
   +--------------------+--------------------+--------------------+
   | SLH-DSA-SHAKE-128s | SLH-DSA-SHAKE-128s | JSON Web Signature |
   |                    |                    | Algorithm for SLH- |
   |                    |                    | DSA-SHAKE-128s     |
   +--------------------+--------------------+--------------------+
   | SLH-DSA-SHA2-128f  | SLH-DSA-SHA2-128f  | JSON Web Signature |
   |                    |                    | Algorithm for SLH- |
   |                    |                    | DSA-SHA2-128f      |
   +--------------------+--------------------+--------------------+

                 Table 1: JOSE Algorithms for SLH-DSA

   This document introduces the registration of the following algorithms
   in [IANA.cose]:

   +====================+============+===============================+
   | Name               | alg        | Description                   |
   +====================+============+===============================+
   | SLH-DSA-SHA2-128s  | TBD1 (-51) | CBOR Object Signing Algorithm |
   |                    |            | for SLH-DSA-SHA2-128s         |
   +--------------------+------------+-------------------------------+
   | SLH-DSA-SHAKE-128s | TBD2 (-52) | CBOR Object Signing Algorithm |
   |                    |            | for SLH-DSA-SHAKE-128s        |
   +--------------------+------------+-------------------------------+
   | SLH-DSA-SHA2-128f  | TBD3 (-53) | CBOR Object Signing Algorithm |
   |                    |            | for SLH-DSA-SHA2-128f         |
   +--------------------+------------+-------------------------------+

                   Table 2: COSE Algorithms for SLH-DSA

4.  SLH-DSA Keys

   Private and public keys are produced to enable the sign and verify
   operations for each of the SLH-DSA algorithms.

   The SLH-DSA Algorithm Family uses the Algorithm Key Pair (AKP) key
   type, as defined in [I-D.ietf-cose-dilithium].  This ensures
   compatibility across different cryptographic algorithms that use AKP
   for key representation.

   The specific algorithms for SLH-DSA, such as SLH-DSA-SHA2-128s, SLH-
   DSA-SHAKE-128s, and SLH-DSA-SHA2-128f, are defined in this document
   and are used in the alg value of an AKP key representation to specify
   the corresponding algorithm.

   Thumbprints for SLH-DSA keys are computed according to the process
   described in [I-D.ietf-cose-dilithium].

5.  Security Considerations

   The security considerations of [RFC7515], [RFC7517] and [RFC9053]
   apply to this specification as well.

   A detailed security analysis of SLH-DSA is beyond the scope of this
   specification; see [FIPS-205] for additional details.

   The following considerations apply to all parameter sets described in
   this specification.

5.1.  Pre-Hash and Hashing Considerations

   SLH-DSA, as specified in [FIPS-205], supports both pure and pre-hash
   modes.  This document specifies only the pure mode of SLH-DSA for use
   with JOSE and COSE.

   This document does not define or register separate HashSLH-DSA
   algorithm identifiers for JOSE or COSE.  Doing so would require
   distinct algorithm registrations and would introduce additional
   implementation and interoperability complexity.  The algorithm
   identifiers defined in this document therefore refer only to the pure
   SLH-DSA variants.

   For many COSE use cases, this restriction is acceptable because the
   application can already structure the signed content in a way that
   limits the amount of data processed directly by the signature
   algorithm.  In particular, applications that need to sign large
   payloads, detached content, or remotely held content may use the COSE
   Hash Envelope mechanism [I-D.ietf-cose-hash-envelope].

   Hash Envelope can provide operational properties similar to those
   sought from a pre-hash signature mode, such as reduced data transfer
   to a signer, reduced buffering requirements, and simplified remote-
   signing workflows.  However, Hash Envelope is not cryptographically
   identical to a standardized pre-hash variant of SLH-DSA.  In Hash
   Envelope, a digest is carried and signed at the COSE layer, whereas
   in a pre-hash signature algorithm the hashing step is part of the
   algorithm definition itself.

   Applications that use Hash Envelope together with SLH-DSA need to
   ensure that the digest is recomputed over the original content and
   compared with the signed digest before treating the signature as
   valid for that content.  Profiles that rely on this construction
   SHOULD specify the permitted hash algorithms and the verification
   procedure explicitly.

   If future deployment experience shows clear demand for algorithm-
   level pre-hash semantics in JOSE or COSE, separate registrations for
   HashSLH-DSA could be defined in a future specification.

5.2.  Validating Public Keys

   All algorithms that operate on public keys require validation before
   use.  For sign, verify and proof schemes, the use of KeyValidate is
   REQUIRED.

5.3.  Side-Channel Attacks

   Implementations of the signing algorithm SHOULD protect the secret
   key from side-channel attacks.  Any implementation of SLH-DSA signing
   algorithms SHOULD employ at least the following best practices:

   *  Constant-time operation

   *  Consistent instruction sequence and memory access

   *  Uniform sampling without information leakage

5.4.  Randomness considerations

   All nonces MUST originate from a trusted and cryptographically secure
   source of randomness.

6.  IANA Considerations

6.1.  New COSE Algorithms

   IANA is requested to add the following entries to the COSE Algorithms
   Registry.

   The following registration templates are provided in accordance with
   the procedures described in [RFC9053] and [RFC9054].

6.1.1.  SLH-DSA-SHA2-128s

   *  Name: SLH-DSA-SHA2-128s

   *  Value: TBD1 (requested assignment -51)

   *  Description: CBOR Object Signing Algorithm for SLH-DSA-SHA2-128s

   *  Capabilities: [kty]

   *  Change Controller: IETF

   *  Reference: RFC XXXX

   *  Recommended: Yes

6.1.2.  SLH-DSA-SHAKE-128s

   *  Name: SLH-DSA-SHAKE-128s

   *  Value: TBD2 (requested assignment -52)

   *  Description: CBOR Object Signing Algorithm for SLH-DSA-SHAKE-128s

   *  Capabilities: [kty]

   *  Change Controller: IETF

   *  Reference: RFC XXXX

   *  Recommended: Yes

6.1.3.  SLH-DSA-SHA2-128f

   *  Name: SLH-DSA-SHA2-128f

   *  Value: TBD3 (requested assignment -53)

   *  Description: CBOR Object Signing Algorithm for SLH-DSA-SHA2-128f

   *  Capabilities: [kty]

   *  Change Controller: IETF

   *  Reference: RFC XXXX

   *  Recommended: Yes

6.2.  New JOSE Algorithms

   IANA is requested to add the following entries to the JSON Web
   Signature and Encryption Algorithms Registry.

   The following completed registration templates are provided as
   described in [RFC7518].

6.2.1.  SLH-DSA-SHA2-128s

   *  Algorithm Name: SLH-DSA-SHA2-128s

   *  Algorithm Description: SLH-DSA-SHA2-128s as described in FIPS 205.

   *  Algorithm Usage Location(s): alg

   *  JOSE Implementation Requirements: Optional

   *  Change Controller: IETF

   *  Specification Document(s): RFC XXXX

   *  Algorithm Analysis Documents(s): [FIPS-205]

6.2.2.  SLH-DSA-SHAKE-128s

   *  Algorithm Name: SLH-DSA-SHAKE-128s

   *  Algorithm Description: SLH-DSA-SHAKE-128s as described in FIPS
      205.

   *  Algorithm Usage Location(s): alg

   *  JOSE Implementation Requirements: Optional

   *  Change Controller: IETF

   *  Specification Document(s): RFC XXXX

   *  Algorithm Analysis Documents(s): [FIPS-205]

6.2.3.  SLH-DSA-SHA2-128f

   *  Algorithm Name: SLH-DSA-SHA2-128f

   *  Algorithm Description: SLH-DSA-SHA2-128f as described in FIPS 205.

   *  Algorithm Usage Location(s): alg

   *  JOSE Implementation Requirements: Optional

   *  Change Controller: IETF

   *  Specification Document(s): RFC XXXX

   *  Algorithm Analysis Documents(s): [FIPS-205]

7.  References

7.1.  Normative References

   [FIPS-205] "Stateless Hash-Based Digital Signature Standard", n.d.,
              <https://doi.org/10.6028/NIST.FIPS.205>.

   [I-D.ietf-cose-dilithium]
              Prorock, M. and O. Steele, "ML-DSA for JOSE and COSE",
              Work in Progress, Internet-Draft, draft-ietf-cose-
              dilithium-11, 15 November 2025,
              <https://datatracker.ietf.org/doc/html/draft-ietf-cose-
              dilithium-11>.

   [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/rfc/rfc2119>.

   [RFC7515]  Jones, M., Bradley, J., and N. Sakimura, "JSON Web
              Signature (JWS)", RFC 7515, DOI 10.17487/RFC7515, May
              2015, <https://www.rfc-editor.org/rfc/rfc7515>.

   [RFC7517]  Jones, M., "JSON Web Key (JWK)", RFC 7517,
              DOI 10.17487/RFC7517, May 2015,
              <https://www.rfc-editor.org/rfc/rfc7517>.

   [RFC7518]  Jones, M., "JSON Web Algorithms (JWA)", RFC 7518,
              DOI 10.17487/RFC7518, May 2015,
              <https://www.rfc-editor.org/rfc/rfc7518>.

   [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/rfc/rfc8174>.

   [RFC9052]  Schaad, J., "CBOR Object Signing and Encryption (COSE):
              Structures and Process", STD 96, RFC 9052,
              DOI 10.17487/RFC9052, August 2022,
              <https://www.rfc-editor.org/rfc/rfc9052>.

   [RFC9053]  Schaad, J., "CBOR Object Signing and Encryption (COSE):
              Initial Algorithms", RFC 9053, DOI 10.17487/RFC9053,
              August 2022, <https://www.rfc-editor.org/rfc/rfc9053>.

   [RFC9054]  Schaad, J., "CBOR Object Signing and Encryption (COSE):
              Hash Algorithms", RFC 9054, DOI 10.17487/RFC9054, August
              2022, <https://www.rfc-editor.org/rfc/rfc9054>.

7.2.  Informative References

   [I-D.ietf-cose-hash-envelope]
              Steele, O., Lasker, S., and H. Birkholz, "COSE Hash
              Envelope", Work in Progress, Internet-Draft, draft-ietf-
              cose-hash-envelope-10, 15 November 2025,
              <https://datatracker.ietf.org/doc/html/draft-ietf-cose-
              hash-envelope-10>.

   [IANA.cose]
              IANA, "CBOR Object Signing and Encryption (COSE)",
              <https://www.iana.org/assignments/cose>.

   [IANA.jose]
              IANA, "JSON Object Signing and Encryption (JOSE)",
              <https://www.iana.org/assignments/jose>.

Appendix A.  Examples

   These examples were generated using Cloudflare CIRCL and cross-
   validated against the Trail of Bits go-slh-dsa implementation.
   Source code is available in the examples/ directory.

A.1.  JOSE

A.1.1.  SLH-DSA-SHA2-128s

   {
     "alg": "SLH-DSA-SHA2-128s",
     "kid": "slh-dsa-sha2-128s-kid",
     "kty": "AKP",
     "priv": "P1d2M4reQEEt09DkH_hmBUPH5mb12TZkfdp6rs2oXjmDHSYmLJWnKQZRp2I6JmQaXPjlAQXhaDtlSspnzER1ag",
     "pub": "gx0mJiyVpykGUadiOiZkGlz45QEF4Wg7ZUrKZ8xEdWo"
   }

          Figure 1: Example SLH-DSA-SHA2-128s Private JSON Web Key

   {
     "alg": "SLH-DSA-SHA2-128s",
     "kid": "slh-dsa-sha2-128s-kid",
     "kty": "AKP",
     "pub": "gx0mJiyVpykGUadiOiZkGlz45QEF4Wg7ZUrKZ8xEdWo"
   }

          Figure 2: Example SLH-DSA-SHA2-128s Public JSON Web Key

A.1.2.  SLH-DSA-SHAKE-128s

   {
     "alg": "SLH-DSA-SHAKE-128s",
     "kid": "slh-dsa-shake-128s-kid",
     "kty": "AKP",
     "priv": "Kz9ljgHX1ryVS2nE7Z_KtfIagmK5Oep1CrBYQcgK75DzFnbI9OqaLaMaevKzl1WJDr3mOmUB9fFg94rq3Lckug",
     "pub": "8xZ2yPTqmi2jGnrys5dViQ695jplAfXxYPeK6ty3JLo"
   }

         Figure 3: Example SLH-DSA-SHAKE-128s Private JSON Web Key

   {
     "alg": "SLH-DSA-SHAKE-128s",
     "kid": "slh-dsa-shake-128s-kid",
     "kty": "AKP",
     "pub": "8xZ2yPTqmi2jGnrys5dViQ695jplAfXxYPeK6ty3JLo"
   }

          Figure 4: Example SLH-DSA-SHAKE-128s Public JSON Web Key

A.1.3.  SLH-DSA-SHA2-128f

   {
     "alg": "SLH-DSA-SHA2-128f",
     "kid": "slh-dsa-sha2-128f-kid",
     "kty": "AKP",
     "priv": "xK3wSzOMhAAx-UW_cj4VeaItS8oe8T_VPHle5tzytYZyOhoZQi9-eEYxrhQIvYSiA95g19KKRovltEe0RNdjYA",
     "pub": "cjoaGUIvfnhGMa4UCL2EogPeYNfSikaL5bRHtETXY2A"
   }

          Figure 5: Example SLH-DSA-SHA2-128f Private JSON Web Key

   {
     "alg": "SLH-DSA-SHA2-128f",
     "kid": "slh-dsa-sha2-128f-kid",
     "kty": "AKP",
     "pub": "cjoaGUIvfnhGMa4UCL2EogPeYNfSikaL5bRHtETXY2A"
   }

          Figure 6: Example SLH-DSA-SHA2-128f Public JSON Web Key

A.2.  COSE

A.2.1.  SLH-DSA-SHA2-128s

   {
     / kty AKP                / 1: 7,
     / alg SLH-DSA-SHA2-128s  / 3: -51,
     / kid                    / 2: h'736c682d6473612d736861322d313238732d6b6964',
     / public key             / -1:
   h'831d26262c95a7290651a7623a26641a5cf8e50105e1683b654aca67cc44756a',
     / private key            / -2:
   h'3f5776338ade40412dd3d0e41ff8660543c7e666f5d936647dda7aaecda85e39
     831d26262c95a7290651a7623a26641a5cf8e50105e1683b654aca67cc44756a',
   }

                Figure 7: Example SLH-DSA-SHA2-128s COSE Key

   18([
     <<{
       / alg SLH-DSA-SHA2-128s / 1: -51,
     }>>,
     / unprotected / {},
     / payload / h'66616b65',
     / signature /
   h'88a36aae95778da5bce3a58808d3fe54b2be969d221d1dff264711598f4b5b32
     ee27ff1397233805989c5934e5766704a1129390ceb3d937be78463d39cf60e2
     4b3c74dadabc7f748da72343844c6a4efb5f829d4025e7be2be63afdeade06a6
     447f3eb884e8df9ca0a10625f7216b12eb75831259183d0fe9b9d6fda4754f6a
     4639646a7bb535338bcba2ffd57812398090f0b6ba9f59fc10478e67e4fcbe06
     5e04c6b371d8a1ef3a75d9871c004d8913929d91d53d6e22ee65401dafd057a1
     6c6adc1de25334940e40624d28bbadad502a531a039d108c195018759cfabdb4
     c97bfd6a40bd0902b3861689f79fed9d551330a76addef62077c2a5cbfc59db2
     d0bef40b313d131f475d6663ed8951483e63249e990ec4c15f99543aeb0af83d
     3491bb7f6c2eed57bedcd87f069303a6e18a188c37c8ca1b1292fb7a1e43479e
     9926457f8acd48818a2cac09dbd1b547467495374f82a5fd9be123f8b01489cd
     edc3b12757c5678944fcb3817c5c7ebe41a6834cec35723dd7d755d1bf127037
     23d5d97101e3d9571dee5f45f55771428058d7e9ba8d49d90e0707d8840d6bde
     94069bab7226ce6d3209e7a84bc61a85bc6236148d8421d7ace6fceab99e1ca4
     f0c8900b2db4a2fbad74e2dbb895d870a6d301e68cf9fb3e87d3afd06e8bade1
     535e41511e5bda2e2d1d1b2167f90b6d64a0961b23e65c90323419708261dc3f
     5d85b847f8fcd080e6fbf0a3ef1faa496cd704399f8cdd14f9c8c9b2e39dbb84
     3d6a21fdfef3c2f6ff955da15a1b4d8d8b317caa957965865b6ca64cb9055fce
     9541796fb02f9c31680e230dc5b2497a595b91e9721c26f4427495a162bcb4b3
     18a55303a05a7089a72debb5b034a67d5338e80ae4b4d903b26c98f906e9611c
     6e87e666a15854d1248f2ccc6a736c42c3f9212f300b587da1f8563938838b5f
     63d00c19d89e951fe7c10647e652dc9e91408f66e03bdf087c893494085c7dd9
     f63cefdb4b69ca99bdf1a647dff354e0e0fb96eaa38922e6fe1001a9a3be2513
     90f2506de734a84ccc3e74fd9fe2c9de72ab01462112a390607662c158022642
     76b1140473cb3766e36d86568e2a15cd0977d7df2711eee96bdb32e4fe66d9a7
     7ccc21ddd36c4a5b4b436b77ea783ca982a17b03b9d55e144e699d83b7f9218e
     68d609a93fbec8695770d1ec27dbaa6e162d635c419ff0fd310f46b8c8a1bba2
     4dcf10e23aee5519a40f123d19f42807fdf97a7084c7b7da84882c267da1a1de
     c28e3a3b7c0f41f1da95f21551acdf55b72511d7ed2e7de7d13a2382b23feb96
     cc2d0dd4bbabef64cd59e67145a94dd02934d75d263bd5a58c7342e9f5815b53
     7ccc7f11545c182d665c7feb87370132a290cfabb26ea73d98e2b51c607a5824
     1e88a324bc4cb099017700846e9884b993d319fa3298e306a484dcb72bf6261d
     b40cfa52050c2133fa5fc0eaa3f84004a85a718a86aa6c70f7b4065ac43ae5b9
     7fd294870ad08b6d06b60705c6486b9c447e3510c2a17d9b8640dfce6b190bd1
     83fc46da15c79bc4dc91e0c93d31ead9e4316342273c65548ecb5e623212f021
     ed460e3f590e84ea8c3040010fabe9b9b86eb1100f8b683d654b4b73c524ed24
     219a1af97a48881d7c6db5fbd8927b6199229afc0613eac26008bca53c592876
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     ff51d930d597593eee077aa5944c57e29c4462436391e27931224534c8d0f9fc
     140a49fe8f8287ada058c25e90f22f6c56566d2885a7cb4865f5fe278bb6ac5c
     7956f6f52b0d3162ba7252165a03b3e4be7411261da512b8f7e8d62854cccbc7
     825575deda52fbc1e7df55c32e1e0a83b8c283c146cd39352af17290b92e8ae3
     64290c19a6a02e0c79f09fe8b1e641aca0efa62cf843e1c8522b0e6451b9a4cf
     c45be3e6138d00ebab66f3ff8a822a633ee2b6dfcc9452fc240e17fbe0fe7855
     156df3501068032b59326203e94cabeb754fce6b9248c809755853b9831381b7
     25d5ec76da35bec90b884297a4c7b11e237b333d075b821b64e837f31e522851
     2ae5d22eded5a3ee4b6ae1d1753e78cf89dc9640880dd3f7f08d75be2a3705eb
     118ae36d099639ce456508adad6c5bc7b725f9a7e651e3a5e7ada03731e38b5c
     fc3d16d7f0c10f5ee6ff130ef2afabb3da3317d10ebe8d7c0d9cfe1928f865c3
     7883a014f086d574cfc160b8c8067244',
   ])

               Figure 8: Example SLH-DSA-SHA2-128s COSE Sign1

A.2.2.  SLH-DSA-SHAKE-128s

   {
     / kty AKP                / 1: 7,
     / alg SLH-DSA-SHAKE-128s / 3: -52,
     / kid                    / 2: h'736c682d6473612d7368616b652d313238732d6b6964',
     / public key             / -1:
   h'f31676c8f4ea9a2da31a7af2b39755890ebde63a6501f5f160f78aeadcb724ba',
     / private key            / -2:
   h'2b3f658e01d7d6bc954b69c4ed9fcab5f21a8262b939ea750ab05841c80aef90
     f31676c8f4ea9a2da31a7af2b39755890ebde63a6501f5f160f78aeadcb724ba',
   }

               Figure 9: Example SLH-DSA-SHAKE-128s COSE Key

   18([
     <<{
       / alg SLH-DSA-SHAKE-128s / 1: -52,
     }>>,
     / unprotected / {},
     / payload / h'66616b65',
     / signature /
   h'739b331fcf62683408d06d279d0726b9cd7ecb471768954695b5ec90d16888f9
     f49aeb20cf27c4c3af7e18307af67904043a786b17511aa9fe1b88edf45e1e6f
     1d3985c2812a27f3a27047af1237bbd084c47740d7961cc3d7cb8c62402e5b70
     c22ee5bdaeabe25e100d8819dce0b84ccf20c97fdeb81c5d0feeaedb5b5cac4e
     a5aa10f06707b524f4abd3c137f1aa136d80e30e53b8c92c1c1c32b76042e1df
     eb163f3fdb9b0e19fa867793e1c2c09f41084015e2a269a63e649c8e3fae30a8
     3352215d517421d25d8604841ed130055f7c931c375bad32c01e40ad980dfbf0
     1cf99fde19ba3b155266ae33bafcc4e5d33a7d2ff585fd016d5c0e610e77e940
     97adb10e897d6257faca3e72e329fa73a93627b8f118926a502b4628879732b5
     195880ee2b9dfb6ac2fc724238fa108a871c6a02ac18b2d976ee621c3b38ce82
     46c9826e596c5e14d2f716721aec7648ccb0953699b77baafbaee343ddd06471
     aa28d6f48c7c5f0b772877c832cab4f970e1ea832aa449db07a63d065867c02c
     3f9783e96732337f9d93fcff16202cbdd41a326aa65fec2e9ea239b276ffe08f
     49f828b190945ae577ff71dbb46384e1f56bd9e44dda52e9df5b9f236b42cf17
     96543639b6795588c19097d211582020fecb1e50cb22190911378a15d0784418
     4ad3ba1c02011202c636d1e4d7062f854c6003e1aebe79571615e95c50dd49ca
     b1eac35884272244d463c7d0a2c97f2c611ed14525a09cd10a3fe1338ec207b1
     355776b655b68e474a70d8453b73410c6a296305093ab476f59c7258763f8f1d
     6c8dab1eeb56910398535e97a4ab34d8002337abb967454b52320eca2c7478fc
     0a962a09c1531f26055da531a1c81283d6788f9f4095ad372c94d5c21b2753b9
     9d57baac19b9be3ea0c2eb53076386d9b52af8fde83edeaa3b61d832edafccf8
     c94d36f756f358ae5e1afdb548c27f479a399b23d3796c76a3298abd98894675
     6ed0663e18d693bd5876294b5ba41d6425cf1589306cc9c4d8d0807701911cdf
     0ccb1294477856e9e0d53ca486ef6df198c6a544011f819253a822bf8ca4ed38
     812135dedfabe9ee6aec72bd3db015b6448e719c69d8491a63e85f3a925c7c2a
     b0e53cf90d6d60bbf8d3e1d881024f9b53a2de46fefd8efad201b437b07176a5
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     439cd929a9e62da1a04e092cc7072aae9f357cea46d2907e4ce1aff9ce290f29
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     cd194eec2fb835bb1db426cb358d1eb566abe87eaec12e1c51b2c6a5f782da63
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     686b2240e34c97461e0f1b6b7e98cee022279ee038958bf261ff5ea86ce091e1
     966c8a877aadda02e47083593c95f0533e157c558725aa6830094fbcb68e0073
     39bd144e271553eeb4d456f9d7b0c301a1d5f8fed8b0bd4b8212a4aa11c4e2cf
     57ea7cbd5cd367398077ec46c2d900a37124584ff248a27695d236638e007965
     b87d94150c078f168badc990ecfae215556677dfdbbc8b6e6407e82580e98ae6
     3ba797f176495b45c41d13148ccf9db003809b193129ca356fc7abdfb1ac9bfe
     686938cf46e20331bbae0490b48546b2e7dc7e4c618f333581f6688ec53927de
     63fb84d01c3cfbc06e599a67e1501b11a4109668edd28479a02b27d4d77b6d4b
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     b0650dacf5150b444cb7e257b8478375d75eb79f6ff9c93eb37b38e0908c5a09
     2aec53cf6da836ae5a02b9ce34053f7c3dc444782e820a90873b36c2f2c4e31a
     4f2e7fe78cf96361b01134cec8a6cb27635749a24690ed1dc8528d0f43bb4ab6
     40c9ee179a83f42bab07ee2c0a013c102e9427cfa15c0812d2d9c4109e545c19
     1502d3ceb590b3a4de440282283a41415bc6665feb28da019fddfe25fc879bde
     09e508e4a446bbf5330595280cded2fa52849a41010acf3f73ee83ad5e3bf576
     7f1b6558b35d94332a4f5dbeaa19e078c70ea21dd9b65e852838dbf4e87e10a5
     3d27e6995c7d649ca890021c80ff9b2ff3ee37fcedee25e06641f3af7a2c8167
     696eb6b86aa648282418f2867733ce0ab435fcebe291d1d142373e8ba22504ae
     26ccb2ace28080b212124d21a003a8bf97d5d130f8e8b305d3e642c8cbe50c21
     add0441df5a2d2f6d1e1682a8e376fa2dbc28efae613d2da208bd71c14aeefa0
     c366fa05876fa7bc0a64563b5c0388bc1c55a25f31a734fa7d36bfde38273e18
     1415ecffab455c1ffecf8e1a1fa4562f5456f31935e2d494cb42815a0a08779d
     8c3ad8f55f25b088746026b313a1365e60d2b5ee8d3ad0c6e2aa900a8f231db8
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     e1cce1ba981889db7f3a74ba70f7a769fc4aeeba088cb5e5a587ae23f6c88f11
     2577275dcb216aea650bbfee47d7ae61f03c65f9bbd6c8067854b5806ce5d9f0
     f8a8a92ddc91f7011f2138b4029e68a9f7049f58b1ae61b9f61afdf47f43fb78
     31069265df2d463a7b2929a49ffb65fa3bcc9948ce1cbfbe7a92a710cd567d90
     15453cd9f8d31a35959adbafb36e4b56ef92858d548fdff47c9ad351af9548db
     01d224ae587da5a1d741614cec3dceeaae04fb5c6ae08a49447db82dd15fd83f
     eebfbc84ffd62753c3ab9982bb1acbfae08148839ba682f7042b239ff8b74266
     a3a41774aedb16aa609d29ebc5b582dc7f8643ae72c74ef92cf63e1d6e787c3f
     02ffafb377cb834c9bc60c42ae0304da0b3e4a530b6c358e9c33464b5143fae7
     a8150919dcb51265c3031bb4e8ab8a1c11aacdc9d58b09a1f15c2163cf652799
     d3254d3f4180328b893a375fff2967ebf9dcb37b70bf78db6b8262725865793f
     296d5712424edec862557925cdf01dc5064c47009aac4d422de070517d483781
     efe6c9582c50940e137daa24db2438006df3f2a3b0d68f7a540ef0e8197c3412
     d99f94e7a1f92e8e3a00af9fc1f9a194bebedb3e045ea85ecc55df361fb8a152
     c574d178816235c699b2058f57bef2ef437023a1bd0015d75e90a0f46c548e60
     246272e1a6c2d585bd20437da4e98770a42e2c7d381bf7ae777cb60a84e5da8c
     b51477df1a9931f78968faccca93b8a2c69b35ca0e97f0b535df4b383c221641
     9a10683e11c93a4ddc5561448ca17c7ec3157c47867c8f5bf8a42d64d51e2ef9
     d259b0b7663e96a8afe63b0f6b981bfe5bf314c0acb61d56fd4d4a98d9eeea79
     80706bfde74108ea07bff67077d41b0954328b650fee243b9d7cc61e0510711b
     5af93f21896884a11a3aa067a8fc4ea365bebabc98b0d72f35273210c6517e79
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     1537667771bec78440eb25082bb91ca8c39d146359bf4d8ea18f85f33dc48aa4
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     53da59211f4ebd3b6c1001da3e8d43664bae414a6b6c10e8c3a0ef6c992901eb
     1450d50ebcbf7825eeb116fb0bee4bad16578f92376e3295aa9b556c65734809
     1375d37c4b0ecc9d2f70102f55a41e0a2a5c08648b56d838d9c05f8c76d3c9c8
     dd847c06f10dd0ccccf1d30afe0618a5caeef732f881139d7fb0f7b4e2ed826c
     0035271f5f0cbeae956e8c80649a4e28dac72bfcadcb64122bc3f8006f2e45c6
     89dd399954f3f59c842924a6ee4bfa2f3c47a15301131cbd4336de726b9cd47e
     554a8a530b7def06542d123dafffe329c5690a95b4b0809a14c174d43d76cafb
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     7e41427a5466fe09ee526e243c648c34435b298047b8216f788a7e1593ff1fde
     08099899713bb343626c505e2ea0ead112baf435b287fc20c43c80ed5a16d76f
     b4c29a085d32baf72edf628466f7a1b797d0f3ddee8282c9bc5ffb35cc2c533f
     127907434ccadf1028c653a1e026e95d913f53923745e173f43bf9bded089e79
     8f5883b03e0dc47fc530f5784a95eaa880042c15f5b5f995421f38af6df9cd79
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     48b705a17cde3267482ca5dc80cd1ebb795c205a0de80f5de86e4fdb1bcb4a83
     d2133f936c3d936ac8853084697edc69ff1e0bbc9a06d585114c198054f02747
     a51715b1b1c6bec922b84f6d49695138fd7a55d3fc7d7ca399823e45710123f9
     7da50fa147eeb2e1c068113c83eccb9a6a2dc76f7b657182c08fbde037f0b843
     08838110e906f1fdae5157f17c6d86d9d33a4b6e3f3b65b83ec916eeb650c491
     bb5c5503c92d6172b5edc8e6011ac65230000013fe467033834c85c19944a0b7
     ee3babd1f56804bd32823c87dfe5694ea66d6275ca47a503584386fff0b3022b
     2d17d0683afa8cc19928b1ccc121d22ae055512e2a56216105454be55046b5b3
     4e16af1fed4ec63a60b247df336217139b4aceda6f23d1c0c47edb819267342a
     2e538b91a8d85e9c255a304b8612c85c40386cd042d04ea5b8e09000ad1b2a09
     96601813d2aa4de1dfd6026bd6186e7305ab31dcb9994e1aa39e40ff4c7f4e37
     212b5764c3976e3b9472bb46deb07359ec84e3b4e12efe0984ee40e785e8608a
     ac794f52157244fc85c88e2e092ef480a977196e9631f4ef242618574742c64c
     ce7c6addbac48bf339e0fb4882bbc775',
   ])

              Figure 10: Example SLH-DSA-SHAKE-128s COSE Sign1

A.2.3.  SLH-DSA-SHA2-128f

   {
     / kty AKP                / 1: 7,
     / alg SLH-DSA-SHA2-128f  / 3: -53,
     / kid                    / 2: h'736c682d6473612d736861322d313238662d6b6964',
     / public key             / -1:
   h'723a1a19422f7e784631ae1408bd84a203de60d7d28a468be5b447b444d76360',
     / private key            / -2:
   h'c4adf04b338c840031f945bf723e1579a22d4bca1ef13fd53c795ee6dcf2b586
     723a1a19422f7e784631ae1408bd84a203de60d7d28a468be5b447b444d76360',
   }

               Figure 11: Example SLH-DSA-SHA2-128f COSE Key

   18([
     <<{
       / alg SLH-DSA-SHA2-128f / 1: -53,
     }>>,
     / unprotected / {},
     / payload / h'66616b65',
     / signature /
   h'0b05f183774f75aa1c1c3f2fcb82271a52e12eeefc8bfbaa78195ade57d71a4a
     85064eb22cdc20e7785e22c32941b5e0a86dc16b14f656a52ed68d3a2aaae017
     ce18c16b1bdf4194cecd9830b18735000bbe9a0cc2d1c10654cd73782840b414
     dec9689dd0cd52b7459532d459e60617b4b82512454ad25f8af87e33e6ede4d4
     0215dfd4a16e5b26e00236e8f46b5d6e876475efdfec0182dca6da17503a3829
     89f59f650f995add144b93e811dee02168ab27f8caa24cb3346d1324463f3afe
     ce1f817364798ebe8d2f398c7a1d6a3955952b9c7c6096daca4b184642760cef
     92ef355c64968fde941d3fadc02d803933ca33f4f95c5372992ca7b7e72c1146
     53af53209476b55cebe75ecc07ec8a7bf1d6a21eb57c204eb2d3736df065a31e
     2c4ad933b1ddf0aca1c83b8754bfa522bba00880b9dec123a899c8d4a9ad7f17
     89a6159066be45dd60424e7ba1576bf6ba3e08eb9f097a689cd7db6369d16a2d
     0288da9476427a0a97774d87d621191d677e32fda6c15c67fbcdbd9611e2bef0
     82fe882d890434cadbbdb58f623196c395d3fcfd1209e72450131f550274e9bd
     17a86dc8189b6653ce85d9729de57c865c56b377a5c8b6a35dd1f845ff1552c2
     24b4ee98f4fd6fc751c82907f713336121e2a0590ecc80b3009dfb3889c747a5
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     5d777e7e2d4f1e306ed93868eb194f5fb48ff839df2b0dee7a44a1add28c5ebe
     88b39f7d69fcd345d50865caae6ed75988f94b7ed0fd0fb80ab49887650ca3fa
     c63db526b67ace8ed26a9d5d4e318078750f276f67e9e3d72d7f8e4d56d837bd
     a9af65a2725baa7235a9dbf838d37be43845bd7795850da1ab72300201478c20
     cc72dd875c012205e14b920a7ea9df15444c73a287f9e0db37d574f1b5ffb278
     cae22d92549cf5f25110ffb1f4e3d5d2604b6288c1026d1c0acaf91fd647bd28
     277f16172f3f1a26a9591a00d1291374b0eed8f7d6017a9e0dcdf9c09450e061
     606449316f7d0551c407518ef6bb829fd210137d2416b410d89df08d6e4af15b
     a5abea624e9b9db41e83e62d917299a017b0403453abdd32660c88c5c4700879
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     cb12a99f9e85ff40479a24719809ad497adbd83325b076af80c3d11baff7623b
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     aa950f168b21295f82afa0748a723f9bea78bb16894cdfb24400dfe64c80b469
     49710eafbf2b1b4b02b6bdaf03639861c5ca03ad26ba23e743d4189f5868a3fc
     e497f7e29246cdc51f1e7e661fc620a0cbc5e5ff53780dd35eb7f4a62b183c29
     1b6ad4a88c4ac951d238576a2b3155243d0a26adf138af8a74534307389a4387
     2a0d066394db0d2adceeee1ae59ff3ed2a859dc64a579d7671ba2826d75adfb9
     4d14180840e0b203a2b873bb9233e2e3bc05e83a082428c9ae1773fba8caa110
     6dd5b42eb1c45171b71b8e0aa0d37061918cc6b5ffe35f0de84fb72219c8e819
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     9e1e060c50433fe04955314cff1e1a56563c154fc8a6053b91f627a7784ca2e6
     402c02218c91d8dcfe5bec2c1f4e94f332bfeb86e38029190ae6d2396b37ae51
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     f74f5456708834dba0c7ddc64e0daa496b8e6b12638cb9330a9fb47ea55379a5
     9792dd2ceab1a9d7c7dc7143d9410a67656049eeabc72890def8e82919d1e72d
     1f628f7150ba69459a48af274b331ac15c731e7dff73aa53a7257fd31e3bb355
     17082f36154b3fb10964ee6d66678b311a28e81ad20c2d258f07c5e3e89bcea0
     782bbbd1e9385f54754d7674b33722743f19f6e4f59e8efea32675df190aa25f
     8359e6bc3373490afe4f7a029b1eda94005976e2ce827b1b9fbd20f13658bff3
     9aa28fa53ccd3cc4a9bb35aadd73f884a0ab6518961dbacb1aba6e31e315a38e
     b1a6bfdc910cb6f722edd7cdcab4df020dea5f49df64ad05e319c89d035bdc7c
     ea635e6d9ab9731c5b9516a966552568e6b3305a6c5ce4d29c74bf1d6cd63b5e
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     1fff7d17ad45dbeea8e5961c1e34c803c9a8c46ca48f7fccd0fc09448645a0b6
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     baf71793dfe26fff94d9e707e12c153a1cf8fbb154c23d5af743861326af13e1
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     98ca614dd86bef36a79a5bd9e4cda2e782b2ebbbbe027e895e839d63095ed165
     d4a5668462634cd0e4bbbabcea94c3ebb930ff953d57ee8833f5ae378030d6bb
     ea2975aa94ce34485215fe5f7cbd6f0e4a19e9b646dd2a62fcd778795d517a1c
     9f67ab0e1ee5a1a684e7eaa7164e5d05ec711101c4a0008df0edfcd7ca2e9935
     01d1a009adcaf31d7ee874d6397915c972b71de6cd5fc07f0eedef4de29ff753
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     9f1470a62381a6b9f511afc9442894b29dd8da9b8e0f828bfc3c994e94d50cb9
     9d38b61f94680b0f86fbb325d305ef2d510914b694eae540acff9fe25479704d
     0901135b156b2ea34ab3690e1e6b98ca853b148bd1ebacac3068bea483ecd21a
     c6b4ba6c60e34bc6b7f386df6749a2b6af77d33426308c03868f3276bb3cd695
     f8f65325cb84dc488d250de86febe07d69db3521e4e6114efbc49075dd090996
     721590174d814af89517fd02f3be6a0d6e97370170078a3eaf58748ec9e486bb
     d42ddcee376f6e3feb5f2f1b90c7896b638414300de2936a3bf28929bbb5d4c5
     a292ec29c9d7b4556a5f3685afed2b26a8999efa2b63dae5ef6806755557e660
     f38c4e9601e3d4121fb0c5421641344ab60bd8ae3eaae2c147b8becb5e7889a9
     755618f3f2e778fe45061d7ab0b3f16bfb686dfb443759599e344f52ae0848be
     714397083453a1ca362a85ff7348b59ec90cdfe96a7ef4fb05405eef840e58a1
     5e6d4a1bd6fc1f83df0783b4cea63b13961d257d755e1beade1f9df779667b2a
     fd2abe6f967d7a0b03ce33616d61ca99118c331076af82c62dde8a792bf17b18
     b321a58271978f3bbb3d92d73aa33d405ade678aeb1c8cb15818da94fc6e96e4
     72f8c55498752e4d55b7483efd6338cf08e2e618a62dd4f6e3f710da997c1533
     5aae43ddb939d1bb99945fb1f3ac9c5a2d2e498646ec4cb44d7c53dbd56fc64c
     62671798b948df0de1bd26a873e0d389a861a38aacb372450b9e6f2997d983e9
     5c6a508adc0af538dc6e438b419b3dae07cb79cf83a9aa7c5be9c4d502c9f9c9
     8739624980896eb48d89650ff171d3c4e38ac24133a484e00b27b9daf8496cfb
     736f9833054c9e2ef7e6dde65bc998ee4789ac16ade8e3a92a69129243e84618
     dce759950c6de8c1a07aa1338f8f227723cf3e5b4b393e6ed4f154ddd9bf7998
     ec9a2703c8b1fd20e80eae0171f3a233034f39d1facf526de5bfee0ffada3829
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     ecbc068db68b618947195f93a889739981949f2d488adeb914839d6e0eff5eb9
     8fb15c6061262a61aff735d592cb64cfe6a2b7e8dda8c4cb466ec1b1679059d0
     155a0e57a1b08625a95d3e2e190bffa839b4f80d8ac9aebc57727440e2522885
     ba8ac13f15198423adb9b51d8edbfaaa1befcbb6f0809c00e1a36099398563b0
     981b452fae4babb1f8f74e39919acca02984c0a437fdd4f898c07174ba60d067
     9fcc1064a3d2733559fce55a27debfc4dcf03dca52881ada047026977552aaa7
     61fac211b43a8da81923175f7046311ba923e0dc0a9ee37d5934466536a8abe5
     da441fff8e05adaf1040616501ffec43e4641282508977af6fa4a964ad5ec83a
     1454f49d1a6095fa3156fd17ab2f2dce027ec8eef6d60777ee4bd8264ac50969
     b505802f36ce44b7bd4dbcbac5b96bb615b3e1e6d97b77da39640e353fa0d6cd
     8ae3ec930b51fdeaa83de4afa0a3837fd66c4bd7957d0ae22a5adaec8a1d5b77
     838e6823df771f6d92ce3307126b99e434819549b6f7db031997b47a1a81b9e4
     744c84ce67de3ef10c675edd16e6beb5604a78f832b3ad148d19dea60ca69f09
     710c82f5c324c4baf7094de9eed03824bfa8cc62895b04c177cd026dcdeffdcd
     f26f4b9de0011018b577f9306d2f8a91087a972985c7ab2d2282ca7562502c0e
     d59dea7a7064bb6868ca2fc2abc1fe2aa7608fb5edbfa7c8cbcb32232970ddfd
     30e067e53d385fc86a613e67c18e9c455dc15079e7e7fce207e57eabcc0c7e62
     eb5f32803b9a7130ac6b4c4682d23cda7764742bf3af01e5a29c43ecb1e3e3cc
     0caed2a4c81673e198d44302d396818e0f2d6e903487b17368f1e0b9740b278f
     d383782fed096937ca69b44f38f14f57571144bcd31d057b92c8d1bcbf318e7c
     73ea72ddbb20b73b89fb94b75f61e37568447c4841ec97ca7659e05b74bb2395
     f1f9feb89288093e4bf803a8f22ad5cab6aee12ea87085d5fc8b306b212edf07
     5b9cce9fb112e306f6f8640e6e63a734d9402dc78682cad9331179b9e0eb227e
     4ff52f3ca675852a2c38ee493b97c8581fd582ea6bc5ee8914411d847bb42b7d
     12133eae733bd0e917d38509e7bd892015024f483938fecd486cd57e865b92b6
     4e94282d2d86b8e0de3db333c9f2ab48a4421733d8a8f31fd0582aed925fc506',
   ])

              Figure 12: Example SLH-DSA-SHA2-128f COSE Sign1

Acknowledgments

   We would like to thank Roy Williams, Cedric Fournet, Simo Sorce,
   Ilari Liusvaara, Neil Madden, Anders Rundgren, David Waite, and Russ
   Housley for their review feedback.

Contributors

   Rafael Misoczki
   Google
   Email: rafaelmisoczki@google.com


   Michael Osborne
   IBM
   Email: osb@zurich.ibm.com


   Christine Cloostermans
   NXP
   Email: christine.cloostermans@nxp.com


Authors' Addresses

   Michael Prorock
   mesur.io
   Email: mprorock@mesur.io


   Orie Steele
   Tradeverifyd
   Email: orie@or13.io


   Hannes Tschofenig
   University of the Bundeswehr Munich
   85577 Neubiberg
   Germany
   Email: hannes.tschofenig@gmx.net