Hashcash
Hashcash is a proof-of-work system designed to limit email spam and denial-of-service attacks.
HashcashProof-of-work systemAdam BackFinancial cryptographyPenny Black (research project)SpamAssassinKey stretchingWhirlpool (cryptography)LabourhomeCost-based anti-spam systemsByzantine fault toleranceHash House HarriersAnonymous remailerIndex of cryptography articlesSHA-2SHA-1Cypherpunk
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HashCash - The "Final Solution" For Spam & Spam Botnets
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Fighting Spam in Drupal with Mollom and Hashcash
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