Use of the Hash-based Signature Algorithm with CBOR Object Signing and Encryption (COSE)
draft-housley-suit-cose-hash-sig-04

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INTERNET-DRAFT                                                R. Housley
Intended Status: Proposed Standard                        Vigil Security
Expires: 2 January 2019                                      2 July 2018

             Use of the Hash-based Signature Algorithm with
               CBOR Object Signing and Encryption (COSE)
                 <draft-housley-suit-cose-hash-sig-04>

Abstract

   This document specifies the conventions for using the Leighton-Micali
   Signature (LMS) algorithm for digital signatures with the CBOR Object
   Signing and Encryption (COSE) syntax.

Status of this Memo

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   provisions of BCP 78 and BCP 79.

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Housley                                                         [Page 1]
INTERNET-DRAFT                                                 July 2018

Copyright and License Notice

   Copyright (c) 2018 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
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  LMS Digital Signature Algorithm Overview . . . . . . . . . . .  3
     3.1.  Hierarchical Signature System (HSS)  . . . . . . . . . . .  4
     3.2.  Leighton-Micali Signature (LMS)  . . . . . . . . . . . . .  5
     3.3.  Leighton-Micali One-time Signature Algorithm (LM-OTS)  . .  6
   4.  Hash-based Signature Algorithm Identifiers . . . . . . . . . .  7
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . .  7
     5.1.  Implementation Security Considerations . . . . . . . . . .  7
     5.2.  Algorithm Security Considerations  . . . . . . . . . . . .  8
   6.  Operational Considerations . . . . . . . . . . . . . . . . . .  8
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
     7.1.  COSE Algorithms Registry Entry . . . . . . . . . . . . . .  9
     7.2.  COSE Key Types Registry Entry  . . . . . . . . . . . . . .  9
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 10
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 10
   Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . 11
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 11

Housley                                                         [Page 2]
INTERNET-DRAFT                                                 July 2018

1.  Introduction

   Today, RSA is often used to digitally sign software updates.  In
   preparation for a day when RSA, DSA, and ECDSA cannot be depended
   upon, a digital signature algorithm is needed that will remain secure
   even if there are significant cryptoanalytic advances or a large-
   scale quantum computer is invented.  The hash-based digital signature
   algorithm specified in [HASHSIG] is one such algorithm.  The use of
   hash-based signatures to protect software update distribution will
   allow the deployment of software that implements new cryptosystems
   even if such advances break current digital signature mechanisms.

   This document specifies the conventions for using the Leighton-Micali
   Signature (LMS) algorithm [HASHSIG] for digital signatures with the
   CBOR Object Signing and Encryption (COSE) [RFC8152] syntax.  The LMS
   algorithm is one form of hash-based digital signature; it can only be
   used for a fixed number of signatures.  The LMS algorithm uses small
   private and public keys, and it has low computational cost; however,
   the signatures are quite large.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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