AES-GCM-SIV: Nonce Misuse-Resistant Authenticated Encryption
draft-irtf-cfrg-gcmsiv-09
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EDIT |
CFRG S. Gueron
Internet-Draft University of Haifa and Amazon Web Services
Intended status: Informational A. Langley
Expires: May 23, 2019 Google LLC
Y. Lindell
Bar Ilan University
November 19, 2018
AES-GCM-SIV: Nonce Misuse-Resistant Authenticated Encryption
draft-irtf-cfrg-gcmsiv-09
Abstract
This memo specifies two authenticated encryption algorithms that are
nonce misuse-resistant - that is that they do not fail
catastrophically if a nonce is repeated.
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
Task Force (IETF). Note that other groups may also distribute
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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 23, 2019.
Copyright 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
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
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
Gueron, et al. Expires May 23, 2019 [Page 1]
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
3. POLYVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Encryption . . . . . . . . . . . . . . . . . . . . . . . . . 4
5. Decryption . . . . . . . . . . . . . . . . . . . . . . . . . 7
6. AEADs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7. Field operation examples . . . . . . . . . . . . . . . . . . 10
8. Worked example . . . . . . . . . . . . . . . . . . . . . . . 10
9. Security Considerations . . . . . . . . . . . . . . . . . . . 11
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 14
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 14
12.1. Normative References . . . . . . . . . . . . . . . . . . 15
12.2. Informative References . . . . . . . . . . . . . . . . . 15
Appendix A. The relationship between POLYVAL and GHASH . . . . . 16
Appendix B. Additional comparisons with AES-GCM . . . . . . . . 18
Appendix C. Test vectors . . . . . . . . . . . . . . . . . . . . 18
C.1. AEAD_AES_128_GCM_SIV . . . . . . . . . . . . . . . . . . 18
C.2. AEAD_AES_256_GCM_SIV . . . . . . . . . . . . . . . . . . 28
C.3. Counter wrap tests . . . . . . . . . . . . . . . . . . . 39
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 40
1. Introduction
The concept of "Authenticated encryption with additional data" (AEAD
[RFC5116]) couples confidentiality and integrity in a single
operation, avoiding the risks of the previously common practice of
using ad-hoc constructions of block-cipher and hash primitives. The
most popular AEAD, AES-GCM [GCM], is seeing widespread use due to its
attractive performance.
However, some AEADs (including AES-GCM) suffer catastrophic failures
of confidentiality and/or integrity when two distinct messages are
encrypted with the same key and nonce. While the requirements for
AEADs specify that the pair of (key, nonce) shall only ever be used
once, and thus prohibit this, in practice this is a worry.
Nonce misuse-resistant AEADs do not suffer from this problem. For
this class of AEADs, encrypting two messages with the same nonce only
discloses whether the messages were equal or not. This is the
minimum amount of information that a deterministic algorithm can leak
in this situation.
Gueron, et al. Expires May 23, 2019 [Page 2]
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