Vipul’s Razor – distributed, collaborative, spam detection and filtering network

Last Updated on September 8, 2023

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.

Website: razor.sourceforge.net
Support:
Developer: Vipul Ved Prakash, Chad Norwood, and others
License: Artistic License

Vipul’s Razor is written in Perl. Learn Perl with our recommended free books and free tutorials.

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