| 摘要 |
PROBLEM TO BE SOLVED: To prevent an authentication algorithm from being easily decoded even by analyzing a communication pattern between a regularity determination apparatus and a product to be determined. SOLUTION: A small-sized information device 1 includes a random number working unit 13 which repeats, just set times, work processing for selecting any one of two random numbers transmitted from a host computer 110 and transmitting a working signal working the selected random number to the host computer 110. The host computer 110 includes: random number generating units 111, 112 for generating two random number for one time of work processing; an arithmetic result judging unit 115 which judges, iteratively just set times, whether the working signal or a working arithmetic result further applying arithmetic processing to the working signal is matched with any one of a plurality of determination arithmetic results operated using the random numbers; and a regular device determination unit 116 which determines the small-sized information device 1 as a regular product when all the determination results as many as the set times indicate matching, and permits a connection with the host computer 110. COPYRIGHT: (C)2008,JPO&INPIT
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