| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio communication system where a private key is generated while suppressing tapping. SOLUTION: While the directivity of an array antenna 20 is switched to n directivities and a carrier frequency is switched to m carrier frequencies, n radio waves are transmitted and received between radio equipments 10 and 30. Then, the radio equipment 10 detects n first radio wave intensities corresponding to n first radio waves received from the radio equipment 30, and generates a private key Ks1 consisting of a bit string based on the detected n first radio wave intensity. Then, the radio equipment 30 detects n second radio wave intensities corresponding to n second radio waves received from the radio equipment 10, and generates a private key Ks2 consisting of the same bit string as that of the private key Ks1 based on the detected n second radio wave intensity. COPYRIGHT: (C)2006,JPO&NCIPI
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