Package hashcash-0.28-1

Hashcash is a denial-of-service counter measure system. Its main use is to help hashcash users avoid losing email due to content based and blacklist based anti-spam systems. Hashcash is payment in burnt CPU cycles by calculating n-bit partial hash collisions on chosen texts. A hashcash token constitutes a proof-of-work which takes a parameterizable amount of work to compute for the sender. The hashcash tool allows you to create hashcash tokens to attach to emails you send, and to verify hashcash tokens attached to emails you receive.