Multimedia authentication and watermarking

Most multimedia signals today are in digital formats which are easy to reproduce and modify without any trace of manipulations. In this chapter, we present a comprehensive review of current technologies for multimedia data authentication and tamper detection. We first introduce in Section 7.2 the problem issues and general requirements for a multimedia authentication system. This is followed in Section 7.3 with detailed descriptions of the current algorithms for the three types of multimedia authentication: hard or complete authentication, soft authentication, and content-based authentication. The conclusion and future research directions are presented in Section 7.4