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Obfuscation of spam filter

  • US 7,519,668 B2
  • Filed: 06/20/2003
  • Issued: 04/14/2009
  • Est. Priority Date: 06/20/2003
  • Status: Expired due to Fees
First Claim
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1. A spam filtering system comprising:

  • a computer processor;

    one or more spam filters;

    and a randomization component that randomizes scores of the filters for one or more messages based at least in part upon a hash computed to randomize the message score, the hash is computed based at least in part upon one or more features extracted from the message whose respective individual contributions to the message score exceed a threshold, thus obfuscating the functionality of the spam filter wherein the spam filtering system making use of a sigmoid function having the formula of
    finalscore=1/1+e

    ^summedscorewherein at least one of the summedscore value or the finalscore value is randomized to effectively modify spammer behavior and to mitigate reverse engineering of the filtering system.

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