COMMUNICATION CARD, SECRET INFORMATION PROCESSING SYSTEM, SECRET INFORMATION TRANSMISSION METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a secret information processing system that prevents unauthorized host equipment from transmitting/receiving data without any authorization by using a communication card, and makes a lately generated unauthorized communication card invalid. SOLUTION: The secret information processing system performs authentication processing, and encryption processing. The authentication processing comprises processing 1700 for determining that both the communication card and the host equipment are unauthorized; processing 1702 for making lately generated unauthorized equipment invalid; and processing 1704 that can be executed only by the host equipment that has been recognized to be authorized as a result of the appropriate execution of the processing, and makes the lately generated unauthorized communication card invalid. In the encryption processing, data transmitted between the communication card and the host equipment are encrypted by a common key that can be generated in the communication card and the host equipment from the processing result only when the authentication processing is executed correctly. COPYRIGHT: (C)2007,JPO&INPIT