RFC 2451 (rfc2451) - Page 1 of 14

The ESP CBC-Mode Cipher Algorithms

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Network Working Group                                       R. Pereira
Request for Comments: 2451                        TimeStep Corporation
Category: Standards Track                                     R. Adams
                                                    Cisco Systems Inc.
                                                         November 1998


                   The ESP CBC-Mode Cipher Algorithms

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.

Copyright Notice

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

Abstract

   This document describes how to use CBC-mode cipher algorithms with
   the IPSec ESP (Encapsulating Security Payload) Protocol.  It not only
   clearly states how to use certain cipher algorithms, but also how to
   use all CBC-mode cipher algorithms.

Table of Contents

   1. Introduction...................................................2
     1.1 Specification of Requirements...............................2
     1.2 Intellectual Property Rights Statement......................2
   2. Cipher Algorithms..............................................2
     2.1 Mode........................................................3
     2.2 Key Size....................................................3
     2.3 Weak Keys...................................................4
     2.4 Block Size and Padding......................................5
     2.5 Rounds......................................................6
     2.6 Backgrounds.................................................6
     2.7 Performance.................................................8
   3. ESP Payload....................................................8
     3.1 ESP Environmental Considerations............................9
     3.2 Keying Material.............................................9
   4. Security Considerations........................................9
   5. References....................................................10
   6. Acknowledgments...............................................11
   7. Editors' Addresses............................................12



Pereira & Adams             Standards Track
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