RFC 3546 (rfc3546) - Page 1 of 29

Transport Layer Security (TLS) Extensions

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Network Working Group                                    S. Blake-Wilson
Request for Comments: 3546                                           BCI
Updates: 2246                                                 M. Nystrom
Category: Standards Track                                   RSA Security
                                                              D. Hopwood
                                                  Independent Consultant
                                                            J. Mikkelsen
                                                               T. Wright
                                                               June 2003

               Transport Layer Security (TLS) Extensions

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 (2003).  All Rights Reserved.


   This document describes extensions that may be used to add
   functionality to Transport Layer Security (TLS).  It provides both
   generic extension mechanisms for the TLS handshake client and server
   hellos, and specific extensions using these generic mechanisms.

   The extensions may be used by TLS clients and servers.  The
   extensions are backwards compatible - communication is possible
   between TLS 1.0 clients that support the extensions and TLS 1.0
   servers that do not support the extensions, and vice versa.

Conventions used in this Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in BCP 14, RFC 2119

Blake-Wilson, et. al.       Standards Track

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