Beat Spam Using Hashcash · Slashdot Mirror

Posted by timothy on Wednesday November 10, 2004 @07:03AM from the variation-on-a-theme dept.

Shell writes "If they want to send spam, make them pay a price. Built on the widely available SHA-1 algorithm, hashcash is a clever system that requires a parameterizable amount of work on the part of a requester while staying "cheap" for an evaluator to check. In other words, the sender has to do real work to put something into your inbox. You can certainly use hashcash in preventing spam, but it has other applications as well, including keeping spam off of Wikis and speeding the work of distributed parallel applications." If you're specifically interested in hashcash for your mail server, Camram has some interesting ideas -- their Frequently Raised Objections page may be illuminating.

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Re: Slashdot Spam Form Response by er_col · 2004-11-10 07:16 · Score: 5, Insightful

Thanks for the usual Spam Form Response. I think it is remarkable that very few choices are marked on it this time around. And if you read the Frequently Raised Objections page, you may well end up with no marks left at all. So this hashcash idea does sound really interesting.