Image Hashing Algorithm: An Analysis and Improvement

Image authentication code algorithms are schemes wherein the authenticity ofan image is considered in a robust war. As the images are mainly subjected tosome authorized modifications, such schemes must be able to accept the authorizedchanges while rejecting the malicious ones. This article analyzes an imageauthentication algorithm based on error detection code. The image authenticationscheme utilizes a type of error detection code in order to encode the mixed mostsignificant bits (MSB) intensity value of each image pixel. The secrecy of systemis based on two secret keys. The algorithm provides an acceptable robustness andelaborate design however, it suffers from some security features that leave a gapfor improvement. These features are analyzed and will be employed to show thevulnerabilities of the scheme. Also, some solutions are proposed to elaborate the algorithmmore. The solutions will increase the strength of the scheme while keepingthe robustness.

Keywords:

Image Authentication , Robustness , Image Hashing , Error detectionand correction.