INFORMATION CARRIER COMPRISING ACCESS INFORMATION

摘要

PROBLEM TO BE SOLVED: To provide an information carrier having access information that further prevents illegal retrieval of user information.

SOLUTION: The information carrier for holding user information comprises access information in the form of access information bits for accessing the user information. The access information bits are stored on the information carrier in a variation of a parameter, the variation is detectable by integration detection. The access information bits are scrambled according to a predetermined scrambling method. By scrambling the access information bits according to a predetermined scrambling method, the access information is not detected as long as the scrambling method is not known. Using the integration detection technique only results in the access information only when it is known how the signal obtained after reading of the area comprising the access information bits must be processed. In this way, illegal retrieval of the user information is further prevented.

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