| 摘要 |
PCT No. PCT/JP89/00706 Sec. 371 Date Mar. 8, 1990 Sec. 102(e) Date Mar. 8, 1990 PCT Filed Jul. 13, 1989 PCT Pub. No. WO90/00781 PCT Pub. Date Jan. 25, 1990.This invention is intended for the communication between a first communication device (e.g., an IC card) and a second communication device (e.g., a card terminal) by preventing the faking of the IC card or card terminal, for example, thereby allowing correct information exchange between them. The invention provides the IC card with a first encryption means and the card terminal with a second encryption means. In consequence, communication signals in both directions are encrypted, and random numbers and the algorism of functional computation are prevented from being analyzed. As a result, manufacturing of fake devices can be prevented and correct information exchange can be performed.
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