Use of the HSS/LMS Hash-based Signature Algorithm with CBOR Object Signing and Encryption (COSE)
draft-ietf-cose-hash-sig-07

Document Type Active Internet-Draft (cose WG)
Last updated 2019-11-04 (latest revision 2019-11-03)
Replaces draft-housley-suit-cose-hash-sig
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Network Working Group                                         R. Housley
Internet-Draft                                            Vigil Security
Intended status: Standards Track                       November 03, 2019
Expires: May 6, 2020

   Use of the HSS/LMS Hash-based Signature Algorithm with CBOR Object
                     Signing and Encryption (COSE)
                      draft-ietf-cose-hash-sig-07

Abstract

   This document specifies the conventions for using the Hierarchical
   Signature System (HSS) / Leighton-Micali Signature (LMS) hash-based
   signature algorithm with the CBOR Object Signing and Encryption
   (COSE) syntax.  The HSS/LMS algorithm is one form of hash-based
   digital signature; it is described in RFC 8554.

Status of This Memo

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   This Internet-Draft will expire on May 6, 2020.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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Housley                    Expires May 6, 2020                  [Page 1]
Internet-Draft          HSS/LMS HashSig with COSE          November 2019

   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  LMS Digital Signature Algorithm Overview  . . . . . . . . . .   3
     2.1.  Hierarchical Signature System (HSS) . . . . . . . . . . .   4
     2.2.  Leighton-Micali Signature (LMS) . . . . . . . . . . . . .   5
     2.3.  Leighton-Micali One-time Signature Algorithm (LM-OTS) . .   6
   3.  Hash-based Signature Algorithm Identifiers  . . . . . . . . .   7
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
     4.1.  Implementation Security Considerations  . . . . . . . . .   7
   5.  Operational Considerations  . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  COSE Algorithms Registry Entry  . . . . . . . . . . . . .   9
     6.2.  COSE Key Types Registry Entry . . . . . . . . . . . . . .   9
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Appendix A.  Examples . . . . . . . . . . . . . . . . . . . . . .  11
     A.1.  Example COSE Full Message Signature . . . . . . . . . . .  11
     A.2.  Example COSE_Sign1 Message  . . . . . . . . . . . . . . .  13
   Appendix B.  Acknowledgements . . . . . . . . . . . . . . . . . .  15
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   This document specifies the conventions for using the Hierarchical
   Signature System (HSS) / Leighton-Micali Signature (LMS) hash-based
   signature algorithm with with the CBOR Object Signing and Encryption
   (COSE) [RFC8152] syntax.  The LMS system provides a one-time digital
   signature that is a variant of Merkle Tree Signatures (MTS).  The HSS
   is built on top of the LMS system to efficiently scale for a larger
   numbers of signatures.  The HSS/LMS algorithm is one form of hash-
   based digital signature, and it is described in [HASHSIG].  The HSS/
   LMS signature algorithm can only be used for a fixed number of
   signing operations.  The number of signing operations depends upon
   the size of the tree.  The HSS/LMS signature algorithm uses small
   public keys, and it has low computational cost; however, the
   signatures are quite large.  The HSS/LMS private key can be very
   small when the signer is willing to perform additional computation at
   signing time; alternatively, the private key can consume additional
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