I-D ACTION:draft-larsen-tsvwg-port-randomization-00.txt

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	Title		: Port Randomization
	Author(s)	: M. Larsen, F. Gont
	Filename	: draft-larsen-tsvwg-port-randomization-00.txt
	Pages		: 15
	Date		: 2006-11-9
	
   Recently, awareness has been raised about a number of "blind" attacks
   that can be performed against the Transmission Control Protocol (TCP)
   and similar protocols.  The consequences of these attacks range from
   throughput-reduction to broken connections or corrupted data.  These
   attacks rely on the attacker's ability to guess or know the four-
   tuple (Source Address, Destination Address, Source port, Destination
   Port) that identifies the transport protocol instance to be attacked.
   This document describes a simple and efficient method for random
   selection of the client port number, such that the possibility of an
   attacker guessing the exact value is reduced.  While this is not a
   replacement for cryptographic methods, the described port number
   randomization algorithms provide improved security/obfuscation with
   very little effort and without any key management overhead.



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