RECORDING DEVICE AND ITS METHOD, DECRYPTION DEVICE AND ITS METHOD, PROVISION MEDIUM AS WELL AS INFORMATION RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To enable the utilization of encrypted information in devices exclusive of a device to which the information is supplied while preventing the illicit utilization thereof by executing mutual authentication with an information memory medium, encrypting a first key with a second key and recording the encrypted information and the encrypted first key to the memory medium. SOLUTION: An encryption section 15 reads a key for movement out of the memory section 21 of an IC card 4, again encrypts the decrypted content key with the key for movement and records the key on an optical disk 5. When the ID read out of the ID memory section 23 of the IC card 4 is decided to be not registered in an ID identification section 18 and is decided to be not mutually authenticated with the IC card 4, the ID identification section 18 or a mutual authentication section 17 executes prescribed error processing. The mutual authentication section 17 decrypts received random numbers with the previously stored common key and if the random numbers coincide with the random numbers before the encryption, the IC card 4 is authethenticated as the correct IC card.