Handwritten signature hiding and extraction using alternate bit-replacement of bi-color images

In this paper, we propose hiding and extraction algorithms for Handwritten Signature. Handwritten Signature Image can be transmitted from source to target securely over untrusted network by using this proposed Data Hiding Algorithm. In this algorithm, size of the carrier image must be double or more the size of source image. If necessary then additional bytes or noise needed to be injected into carrier image to attain the required size. To do this, the header is updated by the new value (sum of original size of file and amount of noise). There are numerous Data Hiding and Extraction algorithms are already proposed. In this paper, we propose a novel and new alternative. Entire work divides into - a. security on transmission; and b. Extraction. This proposed scheme could be applied for ownership protection, copy control, annotation and authentication of digital media. This work is focused on hiding Handwritten Signature during transmission over untrusted network.