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Researchers use "Oksana14_tn.jpg" (the "tn" likely stands for thumbnail) to validate how effectively their software can reassemble fragmented images from raw data.
It is a well-known test file used in the . The research paper that frequently cites and uses this specific file as part of its experimental results is:
This image is part of the DFRWS 2006 Forensic Challenge dataset , which consists of several hundred JPEG files that were fragmented to test "carving" algorithms (recovering files without metadata).