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Razor.sourceforge.net
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“Vipul’s Razor
is a distributed, collaborative, spam detection and
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filtering
network. Through user contribution, Razor establishes a
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distributed and
constantly updating catalogue of spam in
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propagation
that is consulted by email clients to filter out known
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spam. Detection
is done with statistical and randomized
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signatures
that efficiently spot mutating spam content. User input
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is validated
through reputation assignments based on consensus
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on report and
revoke assertions which in turn is used for
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computing
confidence values associated with individual
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signatures.”
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Not a checksum
but a statistical similarity
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