I wrote an overview of Cryptographic Protocols to Prevent Spam,
available at http://eprint.iacr.org/2005/329. This includes a brief
discussion of some non crypto mechanisms as well.
I have tried to maintain reasonable balance between accuracy and
conciseness, and to be fair while not hiding disagreements, criticism
and controversial issues. However, I am sure there is a lot that can be
improved, and will appreciate comments and suggestions for improvements,
and try to incorporate in the final version of this document.
I apologize for cross posting this message, please excuse this - I hope
you won't consider me a spammer...
Department of Computer Science
Bar Ilan University
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