| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio communication system in which eavesdropping of a private key can be suppressed and the private key can be updated in a short time. SOLUTION: One radio device forms the private key Ks1 based on the characteristics of a transmission path between two radio devices when starting encryption communication. Another radio device updates a private key Ks2 by the same method as the updating of the private key Ks1 in the one radio device. The one radio device sequentially forms partial private keys Ks1-p1 to Ks1-pn based on the characteristics of the transmission path, sequentially replaces the partial PA1 to PAn of the private key Ks1 into partial private keys Ks1-p1 to Ks1-pn, and updates the private key Ks1. Moreover, the other radio device updates the private key Ks2 by the same method as the updating of the private key Ks1 in the one radio device. COPYRIGHT: (C)2006,JPO&NCIPI
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