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Defending Against Sequence Number Attacks

Document Type Replaced Internet-Draft (individual)
Expired & archived
Authors Fernando Gont , Steven Bellovin
Last updated 2012-04-19 (Latest revision 2011-01-03)
Replaced by draft-ietf-tcpm-rfc1948bis
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-tcpm-rfc1948bis
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document specifies an algorithm for the generation of TCP Initial Sequence Numbers (ISNs), such that the chances of an off-path attacker of guessing the sequence numbers in use by a target connection are reduced. This document is a revision of RFC 1948, and takes the ISN generation algorithm originally proposed in that document to Standards Track.


Fernando Gont
Steven Bellovin

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)