The Transport Layer Security (TLS) Protocol Version 1.3
draft-ietf-tls-tls13-24

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Network Working Group                                        E. Rescorla
Internet-Draft                                                RTFM, Inc.
Obsoletes: 5077, 5246 (if approved)                    February 15, 2018
Updates: 4492, 5705, 6066, 6961 (if
         approved)
Intended status: Standards Track
Expires: August 19, 2018

        The Transport Layer Security (TLS) Protocol Version 1.3
                        draft-ietf-tls-tls13-24

Abstract

   This document specifies version 1.3 of the Transport Layer Security
   (TLS) protocol.  TLS allows client/server applications to communicate
   over the Internet in a way that is designed to prevent eavesdropping,
   tampering, and message forgery.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 19, 2018.

Copyright Notice

   Copyright (c) 2018 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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   include Simplified BSD License text as described in Section 4.e of

Rescorla                 Expires August 19, 2018                [Page 1]
Internet-Draft                     TLS                     February 2018

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
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   than English.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
     1.1.  Conventions and Terminology . . . . . . . . . . . . . . .   6
     1.2.  Change Log  . . . . . . . . . . . . . . . . . . . . . . .   7
     1.3.  Major Differences from TLS 1.2  . . . . . . . . . . . . .  15
     1.4.  Updates Affecting TLS 1.2 . . . . . . . . . . . . . . . .  17
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .  17
     2.1.  Incorrect DHE Share . . . . . . . . . . . . . . . . . . .  20
     2.2.  Resumption and Pre-Shared Key (PSK) . . . . . . . . . . .  21
     2.3.  0-RTT Data  . . . . . . . . . . . . . . . . . . . . . . .  23
   3.  Presentation Language . . . . . . . . . . . . . . . . . . . .  25
     3.1.  Basic Block Size  . . . . . . . . . . . . . . . . . . . .  25
     3.2.  Miscellaneous . . . . . . . . . . . . . . . . . . . . . .  25
     3.3.  Vectors . . . . . . . . . . . . . . . . . . . . . . . . .  26
     3.4.  Numbers . . . . . . . . . . . . . . . . . . . . . . . . .  27
     3.5.  Enumerateds . . . . . . . . . . . . . . . . . . . . . . .  27
     3.6.  Constructed Types . . . . . . . . . . . . . . . . . . . .  28
     3.7.  Constants . . . . . . . . . . . . . . . . . . . . . . . .  28
     3.8.  Variants  . . . . . . . . . . . . . . . . . . . . . . . .  29
   4.  Handshake Protocol  . . . . . . . . . . . . . . . . . . . . .  30
     4.1.  Key Exchange Messages . . . . . . . . . . . . . . . . . .  31
       4.1.1.  Cryptographic Negotiation . . . . . . . . . . . . . .  31
       4.1.2.  Client Hello  . . . . . . . . . . . . . . . . . . . .  32
       4.1.3.  Server Hello  . . . . . . . . . . . . . . . . . . . .  35
       4.1.4.  Hello Retry Request . . . . . . . . . . . . . . . . .  37
     4.2.  Extensions  . . . . . . . . . . . . . . . . . . . . . . .  39
       4.2.1.  Supported Versions  . . . . . . . . . . . . . . . . .  42
       4.2.2.  Cookie  . . . . . . . . . . . . . . . . . . . . . . .  44
       4.2.3.  Signature Algorithms  . . . . . . . . . . . . . . . .  44