Cryptographic protection of TCP Streams (tcpcrypt)
draft-ietf-tcpinc-tcpcrypt-04

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Document Type Active Internet-Draft (tcpinc WG)
Last updated 2017-01-19 (latest revision 2016-10-31)
Replaces draft-bittau-tcpinc-tcpcrypt
Stream IETF
Intended RFC status Experimental
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Network Working Group                                          A. Bittau
Internet-Draft                                                    Google
Intended status: Standards Track                                D. Boneh
Expires: July 23, 2017                                         D. Giffin
                                                              M. Hamburg
                                                     Stanford University
                                                              M. Handley
                                               University College London
                                                             D. Mazieres
                                                                Q. Slack
                                                     Stanford University
                                                                E. Smith
                                                       Kestrel Institute
                                                        January 19, 2017

           Cryptographic protection of TCP Streams (tcpcrypt)
                     draft-ietf-tcpinc-tcpcrypt-04

Abstract

   This document specifies tcpcrypt, a TCP encryption protocol designed
   for use in conjunction with the TCP Encryption Negotiation Option
   (TCP-ENO) [I-D.ietf-tcpinc-tcpeno].  Tcpcrypt coexists with
   middleboxes by tolerating resegmentation, NATs, and other
   manipulations of the TCP header.  The protocol is self-contained and
   specifically tailored to TCP implementations, which often reside in
   kernels or other environments in which large external software
   dependencies can be undesirable.  Because the size of TCP options is
   limited, the protocol requires one additional one-way message latency
   to perform key exchange before application data may be transmitted.
   However, this cost can be avoided between two hosts that have
   recently established a previous tcpcrypt connection.

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
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Bittau, et al.            Expires July 23, 2017                 [Page 1]
Internet-Draft                  tcpcrypt                    January 2017

   This Internet-Draft will expire on July 23, 2017.

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   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1.  Requirements language . . . . . . . . . . . . . . . . . . . .   3
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Encryption protocol . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Cryptographic algorithms  . . . . . . . . . . . . . . . .   4
     3.2.  Protocol negotiation  . . . . . . . . . . . . . . . . . .   5
     3.3.  Key exchange  . . . . . . . . . . . . . . . . . . . . . .   6
     3.4.  Session ID  . . . . . . . . . . . . . . . . . . . . . . .   8
     3.5.  Session caching . . . . . . . . . . . . . . . . . . . . .   8
     3.6.  Data encryption and authentication  . . . . . . . . . . .  11
     3.7.  TCP header protection . . . . . . . . . . . . . . . . . .  12
     3.8.  Re-keying . . . . . . . . . . . . . . . . . . . . . . . .  12
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