INITIAL INFORMATION GENERATION DEVICE, USER SECRET KEY GENERATION DEVICE, RECORDING MEDIUM INITIALIZATION SETTING DEVICE, DATA ENCRYPTION RECORDING DEVICE AND RECORDING DATA DECRYPTION DEVICE, AND PROGRAM FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a recording medium data management system capable of decrypting encrypted data recorded in a recording medium with a key different for each user.SOLUTION: A recording medium data management system S includes an initial information generation device 1 for generating a function including a constant term in each identification unit of data, a user secret key generation device 2 for generating a function value of a function corresponding to user identification as a secret key, a recording medium initialization device 3 for recording a partial function obtained by excluding the constant term from the function in a recording medium M, a video and audio recording apparatus 4 for encrypting data with a value obtained by subtracting a partial function value corresponding to the user identification of the partial function recorded in the recording medium from the secret key as an encryption key and recording the data in the recording medium M, and a video and audio reproduction apparatus 5 for generating an encryption key by subtracting the partial function value corresponding to the user identification of the partial function recorded in the recording medium M from the secret key, and decrypting the data.