For every matching hash set, X-Ways Forensics also presents a percentage that roughly indicates to what degree the contents of the document match the hash set. For every document that is matched against the database, up to 4 matching hash sets are returned, and the 4 best matching hash sets are picked for that if more than 4 match. That means that if you have 1 copy of an invoice of a company, matching against unknown documents will easily identify other invoices of the same company. invoices created by the same company with the same letterhead) are considered similar by the algorithm even if important details change (billing address, price), depending on the amount of identical text. For that reason, file type verification is applied automatically when FuzZyDoc matching is requested.ĭocuments whose contents are largely identical (e.g. Note that only files with a confirmed or newly identified type will be matched against the FuzZyDoc hash database. Note that numbers in spreadsheet cells are not exploited by the algorithm, only text. , but not Thai, Divehi, Tibetan, Punjabi. Chinese, Japanese, Korean, Indonesian, Malay, Tamil, Tagalog. FuzZyDoc should work well with documents in practically all Western and Eastern European languages, many Asian languages (e.g. Up to 65,535 hash sets are supported in a FuzZyDoc hash database.įuzZyDoc is available to all users of X-Ways Forensics and X-Ways Investigator (i.e. For each selected document you can create 1 separate hash set, or you can create 1 hash set for all selected documents. Hash sets based on selected documents can be added to the FuzZyDoc database exactly like hash sets can be created in ordinary hash databases, and the FuzZyDoc hash database can also be managed in the same dialog window as the other hash databases, so existing users will have no trouble locating and using the new functionality. So there are now 5 hash databases available in total, and counting. The technology is called FuzZyDoc.įuzZyDoc hash values are stored in yet another hash database in X-Ways Forensics. Very often even if text was inserted/removed/reordered/revised, a document can still be recognized. after a "Save as" or or after printing (which may update a "last printed" timestamp), do not prevent identification either. first PPT, then PPTX, then PDF), it can still be recognized. Even if a document was stored in a different file format (e.g. ) with a much more robust approach than conventional hash values.
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