Hard Authentication Using Dot Array Carrier Structure
Anil Audumbar Pise, Hrishikesh Chabukswar, Deepak R. Jadhav · 2013
This paper describes an optical watermarking, for the authentication of original printed documents. An optical watermark is a two- dimensional binary image. It can be of any shape and can be printed on any part of a document. The hidden information is embedded using phase modulation. This hidden information becomes visible to the human eyes only when a right key is positioned on the top of the optical watermark with the right alignment. Here, keys play the similar role as keys in encryption that is to decode hidden information. Thus, with such a lock and key approach,it greatly improves the security level of optical watermark. Due to it's high security and tight link with electronic document systems, the optical watermarks are widely used for hard document or printed documents for there authentication.