2012 Symposium Posters

Project Members
Shriphani Palakodety, Aravind K. Mikkilineni, Mikahil Atallah, Edward J. Delp

This paper deals with the forensic problem of determining whether a document has been scanned and re-printed, as opposed to being the original printout. We consider two cases: (i) the adversary did no deliberate alteration of the contents of the document between the scanning and the second printing; (ii) the adversary carries out one or more deliberate alterations to the document, such as changing a date, name, or dollar amount. In the latter case, we also want to determine the locations of the alteration(s). We would like the document to inherently carry the evidence of its own originality and of any illicit alterations that can be carried out. We first present a framework to determine document originality based on an existing embedding scheme for laser printed documents. We follow up with an adaptation to this framework of techniques from combinatorial group testing.