A DCT robust multimedia authentication scheme

In this paper, we analyze a fragile watermark algorithm of Lisa M. Marvel et al. (2000) and show a security weakness therein. We then show that a fragile watermark could not survive DCT compression as long as the authenticator is constructed from pixel values. After that, a new algorithm is presented, which gets rid of the severe security weakness and the implementation flaw of Lisa M. Marvel et al.'s method.