Generic attacks on content-based video stream authentication

The widespread use of mobile platforms for online multimedia on-the-go necessitates a secure and efficient multimedia authentication scheme catered for mobile devices. In this paper, we study the security of using existing content-based authentication schemes to efficiently protect the integrity of video streams while allowing content-preserving manipulations. We point out a common design flaw in existing content-based authentication schemes. Built upon the concept of video coding, we demonstrate generic attacks that exploit this flaw and show that existing schemes in the transform domain cannot detect content-changing attacks on the video stream.