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Microsoft Researching Anti-Spam Technique

Posted by michael on from the penny-for-your-thoughts dept.

Tim C writes "Microsoft's Research group are working on a technique to combat spam. Dubbed the 'Penny Black project', it involves making email senders perform a computation taking around 10 seconds, which their recipients can then check for. This delay would limit bulk emailing speeds to around 8000 a day, meaning that to spam all of those 'fresh, guaranteed 25 million addresses' would take approximately 8.5 years." We've reported on this before.

2 of 660 comments (clear)

  1. Involves calculating hashes by baseinfinity · · Score: 5, Interesting

    We studied this in a computer security course I took. This technique has been proposed to TCP establishment as well. It involves the server calculating a hash of a particular nonce (random value). The server then provides the hash and a certain number of bits of the nonce. It becomes the clients job to complete the nonce such that the value hashes out correctly. The server can vary the number of bits it provides to vary the difficulty of the puzzle...

  2. Comment removed by account_deleted · · Score: 5, Interesting

    Comment removed based on user account deletion