Vipul's Razor
Vipul's Razor is a checksum-based, distributed, collaborative,
spam-detection-and-filtering network. The primary focus of the system
is to identify and disable an email spam before its injection and
processing is complete.
Razor establishes a distributed and
constantly updating catalogue of spam in propagation. This catalogue is
used by clients to filter out known spam. On receiving a spam, a Razor
Reporting Agent (run by an end-user or a troll box) calculates and
submits a 20-character unique identification of the spam (a SHA Digest)
to its closest Razor Catalogue Server. The Catalogue Server echos this
signature to other trusted servers after storing it in its database.
Prior to manual processing or transport-level reception, Razor
Filtering Agents (end-users and MTAs) check their incoming mail against
a Catalogue Server and filter out or deny transport in case of a
signature match. Catalogued spam, once identified and reported by a
Reporting Agent, can be blocked out by the rest of the Filtering Agents
on the network.
Detection is undertaken with statistical and
randomized signatures that efficiently spost 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.
Features include:
- Ephemeral Signatures
- Supports several preprocessors
- Multiple Filteration Engines
- Base64 signature encoding
- Truth Evaluation System (TeS)
- Submission of entire spam messages
- Revocation; allows users to revoke messages that they don't
consider to be spam
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Last Updated Monday, July 28 2008 @ 03:09 PM EDT
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