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This paper presents a novel technique for authenticating physical documents based on random, naturally occurring imperfections in paper texture. We introduce a new method for measuring the three-dimensional surface of a page using only a commodity scanner and without modifying the document in any way. From this physical feature, we generate a concise fingerprint that uniquely identifies the document. Our technique is secure against counterfeiting and robust to harsh handling; it can be useddoi:10.1109/sp.2009.7 dblp:conf/sp/ClarksonWFHHF09 fatcat:tuwnfjvrkbcshdzvqfgawx3sne