What is Visual Hash Function

Digital video authentication has been a topic of immense interest to researchers in the past few years. Authentication of a digital video refers to the process of determining that the video taken is original and has not been tampered with. This chapter aims to provide an overview of digital video authentication systems and a universal review of the associated methods. The chapter not only establishes the importance of authenticating a video in various application scenarios; it also identifies key properties and design issues that should be considered while designing a video authentication system. The benign and tampering operations that characterize the security and robustness aspects of a typical video authentication system are described. The past works related to video authentication, based on digital signature and digital watermarking, have been described; and the emerging trends in this area of research have also been identified.