An overview of cryptographic protocols to prevent spam

Amir Herzberg herzbea at
Sun Sep 25 12:27:16 EDT 2005

I wrote an overview of Cryptographic Protocols to Prevent Spam, 
available at 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...
Best regards,

Amir Herzberg

Associate Professor
Department of Computer Science
Bar Ilan University
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