Hash-Based Signatures
draft-mcgrew-hash-sigs-03

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Crypto Forum Research Group                                    D. McGrew
Internet-Draft                                                 M. Curcio
Intended status: Informational                             Cisco Systems
Expires: April 21, 2016                                 October 19, 2015

                         Hash-Based Signatures
                       draft-mcgrew-hash-sigs-03

Abstract

   This note describes a digital signature system based on cryptographic
   hash functions, following the seminal work in this area of Lamport,
   Diffie, Winternitz, and Merkle, as adapted by Leighton and Micali in
   1995.  It specifies a one-time signature scheme and a general
   signature scheme.  These systems provide asymmetric authentication
   without using large integer mathematics and can achieve a high
   security level.  They are suitable for compact implementations, are
   relatively simple to implement, and naturally resist side-channel
   attacks.  Unlike most other signature systems, hash-based signatures
   would still be secure even if it proves feasible for an attacker to
   build a quantum computer.

Status of This Memo

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Copyright Notice

   Copyright (c) 2015 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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   (http://trustee.ietf.org/license-info) in effect on the date of

McGrew & Curcio          Expires April 21, 2016                 [Page 1]
Internet-Draft            Hash-Based Signatures             October 2015

   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Conventions Used In This Document . . . . . . . . . . . .   4
   2.  Interface . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Notation  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Data Types  . . . . . . . . . . . . . . . . . . . . . . .   4
       3.1.1.  Operators . . . . . . . . . . . . . . . . . . . . . .   5
       3.1.2.  Strings of w-bit elements . . . . . . . . . . . . . .   5
     3.2.  Security string . . . . . . . . . . . . . . . . . . . . .   6
     3.3.  Functions . . . . . . . . . . . . . . . . . . . . . . . .   8
   4.  LM-OTS One-Time Signatures  . . . . . . . . . . . . . . . . .   8
     4.1.  Parameters  . . . . . . . . . . . . . . . . . . . . . . .   8
     4.2.  Hashing Functions . . . . . . . . . . . . . . . . . . . .   9
     4.3.  Signature Methods . . . . . . . . . . . . . . . . . . . .   9
     4.4.  Private Key . . . . . . . . . . . . . . . . . . . . . . .  10
     4.5.  Public Key  . . . . . . . . . . . . . . . . . . . . . . .  10
     4.6.  Checksum  . . . . . . . . . . . . . . . . . . . . . . . .  11
     4.7.  Signature Generation  . . . . . . . . . . . . . . . . . .  11
     4.8.  Signature Verification  . . . . . . . . . . . . . . . . .  12
     4.9.  Notes . . . . . . . . . . . . . . . . . . . . . . . . . .  13
     4.10. Formats . . . . . . . . . . . . . . . . . . . . . . . . .  13
   5.  Leighton Micali Signatures  . . . . . . . . . . . . . . . . .  16
     5.1.  LMS Private Key . . . . . . . . . . . . . . . . . . . . .  16
     5.2.  LMS Public Key  . . . . . . . . . . . . . . . . . . . . .  17
     5.3.  LMS Signature . . . . . . . . . . . . . . . . . . . . . .  17
       5.3.1.  LMS Signature Generation  . . . . . . . . . . . . . .  18
     5.4.  LMS Signature Verification  . . . . . . . . . . . . . . .  18
     5.5.  LMS Formats . . . . . . . . . . . . . . . . . . . . . . .  19
   6.  Hierarchical signatures . . . . . . . . . . . . . . . . . . .  21
     6.1.  Key Generation  . . . . . . . . . . . . . . . . . . . . .  21
     6.2.  Signature Generation  . . . . . . . . . . . . . . . . . .  21
     6.3.  Signature Verification  . . . . . . . . . . . . . . . . .  22
   7.  Rationale . . . . . . . . . . . . . . . . . . . . . . . . . .  22
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