ChaCha20-Poly1305 Cipher Suites for Transport Layer Security (TLS)
draft-ietf-tls-chacha20-poly1305-03

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Document Type Active Internet-Draft (tls WG)
Last updated 2015-11-30
Replaces draft-mavrogiannopoulos-chacha-tls
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Network Working Group                                         A. Langley
Internet-Draft                                                  W. Chang
Updates: 5246, 6347 (if approved)                             Google Inc
Intended status: Standards Track                    N. Mavrogiannopoulos
Expires: June 2, 2016                                            Red Hat
                                                         J. Strombergson
                                                      Secworks Sweden AB
                                                            S. Josefsson
                                                                  SJD AB
                                                       November 30, 2015

   ChaCha20-Poly1305 Cipher Suites for Transport Layer Security (TLS)
                  draft-ietf-tls-chacha20-poly1305-03

Abstract

   This document describes the use of the ChaCha stream cipher and
   Poly1305 authenticator in the Transport Layer Security (TLS) and
   Datagram Transport Layer Security (DTLS) protocols.

Status of This Memo

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   This Internet-Draft will expire on June 2, 2016.

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   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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   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  ChaCha20 Cipher Suites  . . . . . . . . . . . . . . . . . . .   3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   This document describes the use of the ChaCha stream cipher and
   Poly1305 authenticator in version 1.2 or later of the the Transport
   Layer Security (TLS) [RFC5246] protocol, as well as version 1.2 or
   later of the Datagram Transport Layer Security (DTLS) protocol
   [RFC6347].

   ChaCha [CHACHA] is a stream cipher developed by D.  J.  Bernstein in
   2008.  It is a refinement of Salsa20, which is one of the selected
   ciphers in the eSTREAM portfolio [ESTREAM], and was used as the core
   of the SHA-3 finalist, BLAKE.

   The variant of ChaCha used in this document has 20 rounds, a 96-bit
   nonce and a 256-bit key, and will be referred to as ChaCha20.  This
   is the conservative variant (with respect to security) of the ChaCha
   family and is described in [RFC7539].

   Poly1305 [POLY1305] is a Wegman-Carter, one-time authenticator
   designed by D.  J.  Bernstein.  Poly1305 takes a 256-bit, one-time
   key and a message, and produces a 16-byte tag that authenticates the
   message such that an attacker has a negligible chance of producing a
   valid tag for an inauthentic message.  It is also described in
   [RFC7539].

   ChaCha and Poly1305 have both been designed for high performance in
   software implementations.  They typically admit a compact
   implementation that uses few resources and inexpensive operations,
   which makes them suitable on a wide range of architectures.  They
   have also been designed to minimize leakage of information through
   side channels.

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   Recent attacks [CBC-ATTACK] have indicated problems with the CBC-mode
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