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Network Working Group                                         J. Salowey
Request for Comments: 5288                                  A. Choudhury
Category: Standards Track                                      D. McGrew
                                                     Cisco Systems, Inc.
                                                             August 2008


          AES Galois Counter Mode (GCM) Cipher Suites for TLS

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Abstract

   This memo describes the use of the Advanced Encryption Standard (AES)
   in Galois/Counter Mode (GCM) as a Transport Layer Security (TLS)
   authenticated encryption operation.  GCM provides both
   confidentiality and data origin authentication, can be efficiently
   implemented in hardware for speeds of 10 gigabits per second and
   above, and is also well-suited to software implementations.  This
   memo defines TLS cipher suites that use AES-GCM with RSA, DSA, and
   Diffie-Hellman-based key exchange mechanisms.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 2
   2.  Conventions Used in This Document . . . . . . . . . . . . . . . 2
   3.  AES-GCM Cipher Suites . . . . . . . . . . . . . . . . . . . . . 2
   4.  TLS Versions  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
     6.1.  Counter Reuse . . . . . . . . . . . . . . . . . . . . . . . 4
     6.2.  Recommendations for Multiple Encryption Processors  . . . . 4
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 6
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 6

Salowey, et al.             Standards Track                     [Page 1]