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• php_ssdeep Fuzzy Hashing PHP Extension August 31, 2010

  php_ssdeep Fuzzy Hashing PHP Extension **Updated 16/9:**php_ssdeep is now in PECL so I have updated this post to reflect that. On a recent project I needed a fast way to compare documents for likeness and return a percentage match. With much research and one unanswered Stackoverflow post later I came across Jesse Kornblum’s ssdeep utility intended for computer forensics such as looking for signatures in files when hunting rootkits etc. All the technical details of fuzzy hashing are described in his 2006 journal article Identifying almost identical files using context triggered piecewise hashing. Read more ⇒