Internet Engineering Task Force A. Bittau
Internet-Draft D. Boneh
Intended status: Standards Track M. Hamburg
Expires: August 18, 2014 Stanford University
University College London
February 14, 2014
Cryptographic protection of TCP Streams (tcpcrypt)
This document presents tcpcrypt, a TCP extension for
cryptographically protecting TCP segments. Tcpcrypt maintains the
confidentiality of data transmitted in TCP segments against a passive
eavesdropper. It protects connections against denial-of-service
attacks involving desynchronizing of sequence numbers, and when
enabled, against forged RST segments. Finally, applications that
perform authentication can obtain end-to-end confidentiality and
integrity guarantees by tying authentication to tcpcrypt Session ID
The extension defines two new TCP options, CRYPT and MAC, which are
designed to provide compatible interworking with TCPs that do not
implement tcpcrypt. The CRYPT option allows hosts to negotiate the
use of tcpcrypt and establish shared secret encryption keys. The MAC
option carries a message authentication code with which hosts can
verify the integrity of transmitted TCP segments. Tcpcrypt is
designed to require relatively low overhead, particularly at servers,
so as to be useful even in the case of servers accepting many TCP
connections per second.
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Bittau, et al. Expires August 18, 2014 [Page 2]Internet-Draft tcpcrypt February 2014Table of Contents
1. Requirements Language . . . . . . . . . . . . . . . . . . . . 5
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Idealized protocol . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Stages of the protocol . . . . . . . . . . . . . . . . . . 5
3.1.1. The setup phase . . . . . . . . . . . . . . . . . . . 6