A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Computational Puzzles for SPAM Reduction in SIP
Author(s) : C. Jennings
Filename : draft-jennings-sip-hashcash-03.txt
Pages : 30
Date : 2005-10-26
One of the techniques used in SPAM prevention and various solutions
for denial of service attacks is to force the SIP client requesting a
service to perform a calculation that limits the rate and increases
the cost of the request. This draft defines a way to allow a UAS to
ask the UAC to compute a computationally expensive hash based
function and present the result to the UAS. Although the computation
is expensive for the UAC to compute, it is cheap for the UAS to
verify. The solution also allows for proxies to compute and check
the puzzle on behalf of the UAC or UAS.
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