Video Authentication Using Watermark and Digital Signature-A Study

Widespread and easily available tools have become common for video synthesis and maneuvring in the digital era. It is therefore necessary, imperative and difficult as well to ensure the authenticity of video information. Authenticity and trustworthiness of the video is of paramount importance in a variety of areas like court of law, surveillance systems, journalism, advertisement, movie industry and medical world. Any malicious alteration or modification could affect the decisions taken based on these videos. Video authentication and tampering detection techniques due to intentional changes which are visible or invisible in a video are discussed in this paper.