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Distributing digital document through insecure channel leads to the question of the integrity and the ownership of the file on the receiver's side. Employing hash function and digital signature algorithms solves the difficulties of the receiver to proof the approval of the document from the sender as well as detecting if the file has been altered by illegitimate parties. In this paper, a method to attach digital signature in Portable Document File (PDF) as invisible watermark is proposed. Wedoi:10.1109/uksim.2012.81 dblp:conf/uksim/ShaikhliZMP12 fatcat:c5svasf2avccxlzkdfgyq4r7vq