Information support comprising access information

摘要

Information support for containing the user information, the information support comprising the access information in the form of access information bits to access the user information, the access information bits being stored in the information carrier in a variation of a physical parameter, the access information bits being present in key frames, characterized in that the variation has a small amplitude, based on a spread spectrum technique, to be detected only by integration detection, and because the bits of Access information is encrypted according to a predetermined encryption method, an encryption method comprising a permutation of the access information bits, permutation that is different for each key frame.