PREPAID CARD SYSTEM, CERTIFICATION SYSTEM, READER, MANAGEMENT DEVICE, AND DEVICE CERTIFICATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a prepaid card system which can simultaneously transmit certification data to the device to be certified from a certification device, certifies them at a high speed, combines the ciphering of entire certification data and the ciphering of a part of data and discriminates the cause of the certification error of the device of the certification object. SOLUTION: A relay device 3 designates a global address and simultaneously transmits all certification data to all readers 1. The respective readers 1 receiving certification data cipher a part of certification data with an individual password key, cipher the entire certification data with a common password and return them to the relay device 3. The relay device 3 decodes certification data returned from the readers 1 for certifying them commonly in the system and compares it with certification data. The relay device 3 compares a part of data certified by the readers 1 with the individual password in certification data returned from the readers 1 in certification data returned form the readers 1, with the password with a block which is the object of password data for certification for individually certifying the devices.