RFC 3185 (rfc3185) - Page 1 of 10

Reuse of CMS Content Encryption Keys

Network Working Group                                         S. Farrell
Request for Comments: 3185                        Baltimore Technologies
Category: Standards Track                                      S. Turner
                                                                    IECA
                                                            October 2001


                  Reuse of CMS Content Encryption Keys

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 (2001).  All Rights Reserved.

Abstract

   This document describes a way to include a key identifier in a CMS
   (Cryptographic Message Syntax) enveloped data structure, so that the
   content encryption key can be re-used for further enveloped data
   packets.

Table Of Contents

   1. Introduction...................................................  2
   2. Applicability..................................................  2
   3. How to do it...................................................  3
   4. Using different CEK and KEK algorithms.........................  4
   5. Conformance....................................................  5
   6. Security Considerations........................................  5
   7. References.....................................................  6
   Authors' Addresses................................................  6
   Appendix A: ASN.1 Module..........................................  7
   Full Copyright Statement.......................................... 10











Farrell & Turner            Standards Track