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Microsoft Researchers on Stopping Spam
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Old 12th April 2005, 10:21   #1
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Default Microsoft Researchers on Stopping Spam

Scientific American today has a very interesting article about "Stopping Spam" by Joshua Goodman, David Hackerman and Robert Rounthwaite from Microsoft Research. They talk about different types of spam -- spam with emails, spam on IMs, spamlinks on web pages and image based spam. They mention different techniques for spam filtering mainly fingerprinting matching techniques, n grams model, naive bayesian approach, optical character recognition, challenge/response systems and Human Interacted Proofs (HIP) in a very lucid style. They however do not mention fingerprinting approach of using Nilsimsa Hash to tackle addition of random words by spammers in emails or hypertextus interruptus technique used by spammers of splitting words using HTML comments, pairs of zero width tags, or bogus tags. Also, Spam-Research is reporting the SplitFit Technique that Spammers are using to fool Yahoo! Mail SpamGuard.
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