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| Wednesday, January 30, 2013

ssdeep is a program for computing context triggered piecewise hashes (CTPH). Also called fuzzy hashes, CTPH can match inputs that have homologies. Such inputs have sequences of identical bytes in the same order, although bytes in between these sequences may be different in both content and length.

A complete explanation of CTPH can be found in Identifying almost identical files using context triggered piecewise hashing from the journal Digital Investigation. There is a free version of this paper available through the Digital Forensic Research Workshop conference, free version of Identifying almost identical files using context triggered piecewise hashing.

There are some usage scenarios in the Quickstart guide and the Forensics Wiki entry on ssdeep.

The package also includes a fuzzy hashing API. The API is documented in the file API.TXT in the Windows distribution and README in the source code package.

See Also

The math behind fuzzy hashing was originally developed by Dr. Andrew Trigdell in a spam dectector he called spamsum. 

Supported Platforms

Microsoft Windows

The program runs on Microsoft Windows 2000, XP, 2003, and Vista. It is not supported on Windows 95, 98, Me, 3.1, 3.11, or 3.11 for Workgroups.


The program has been tested on Open Solaris, FreeBSD, Linux, and Mac OS X. It should compile and run on any other platform that is supported by the GNU Build Tools.

Read more: Sourceforge
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