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