HashCash

HashCash is an anti-spam, anti-DoS system for email. The concept centers around the sender of the mail completing a computationally expensive task (in this case, generating hash collisions) that the recipient can verify very quickly. This allows the sender to "pay" for transport in CPU cycles, creating artificial scarcity. Programs are included to add payment to messages (for the sender) and to verify message payment (for the recipient).

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Recent releases

• 
• 1.09

• 
•  01 Oct 2004 02:12
• 

• Initial freshmeat announcement

No changes have been submitted for this release.

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Recent comments

01 Oct 2004 17:12 adamback

spam assassin 3.0
spam assassin 3.0 supports hashcash

could still really use hashcash support for mozilla mail (thunderbird/mozilla mail).

See: for the tracking bug (www.hashcash.org/mail/...) info

01 Oct 2004 02:46 samjam

Good idea....
and will thus require all "owned" machines to be upgraded with new spamming software than can compute these hashes. Maybe owners will wonder why their PC's are slowing down.