ECDSA Signatures in Verification-Friendly Format
draft-struik-lamps-verification-friendly-ecdsa-00

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lwig                                                           R. Struik
Internet-Draft                               Struik Security Consultancy
Intended status: Informational                         February 22, 2021
Expires: August 26, 2021

            ECDSA Signatures in Verification-Friendly Format
           draft-struik-lamps-verification-friendly-ecdsa-00

Abstract

   This document specifies how to represent ECDSA signatures so as to
   facilitate fast verification of single signatures and fast batch
   verification.  We illustrate that this technique can be applied
   retroactively by any device (rather than only by the signer), thereby
   facilitating transitioning to always generating ECDSA signatures in
   this way.

Requirements Language

   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.

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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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on August 26, 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   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
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Fostering Fast Verification with ECDSA  . . . . . . . . . . .   2
   2.  Review of ECDSA and ECDSA*  . . . . . . . . . . . . . . . . .   3
   3.  Signature Verification with ECDSA and ECDSA*  . . . . . . . .   4
   4.  Transitionary Considerations  . . . . . . . . . . . . . . . .   5
   5.  Implementation Status . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   6
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     10.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Fostering Fast Verification with ECDSA

   ECDSA is one of the most widely used elliptic-curve digital signature
   algorithms.  It has been standardized in FIPS Pub 186-4, ANSI X9.62,
   BSI, SECG, and IETF, and is widely deployed by a plethora of internet
   protocols specified by the Internet Engineering Task Force (IETF),
   with industry specifications in the areas of machine-to-machine
   communication, such as ZigBee, ISA, and Thread, with wireless
   communication protocols, such as IEEE 802.11, with payment protocols,
   such as EMV, with vehicle-to-vehicle (V2V) specifications, as well as
   with electronic travel documents and other specifications developed
   under a more stringent regulatory oversight regime, such as, e.g.,
   ICAO and PIV.  ECDSA is the only elliptic-curve based signature
   scheme endorsed by regulatory bodies in both the United States and
   the European Union.

   While methods for accelerated verification of ECDSA signatures and
   for combining this with key computations have been known for over 1
   1/2 decade (see, e.g., [SAC2005] and [SAC2010]), these have been
   commonly described in technical papers in terms of ECDSA*, a slightly
   modified version of ECDSA, where their use with standardized ECDSA
   seems less well known.  It is the purpose of this document to fill

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