ABSTRACT
This chapter focuses on the discussion of authenticating multimedia content based on digital signature schemes, although digital watermarking techniques might be employed in some specific schemes. It presents the techniques from multimedia processing and analysis, security and cryptography, communication and coding. Multimedia authentication is a relatively new research area compared to other “traditional” research areas such as multimedia compression. Different researchers with different research backgrounds may have different understandings of the term “authentication.” The semifragile content authentication mode is usually selected for medical or remote-imaging-related applications where lossless recovery of the original image is required. The performance of a media authentication system mainly relates to its system security and system robustness. The histogram of an image represents the relative frequency of occurrence of the various gray levels in the image. To quantitatively evaluate system performance on robustness, two important measures used are false acceptance rate and false rejection rate.
