| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio communications system capable of suppressing wiretapping of secret key. SOLUTION: While switching the directivity of an array antenna 20 to n pieces of directivity, n radio waves are transmitted/received between radio devices 10, 30. The radio device 10 detects n first radio wave intensity levels, corresponding to n first radio waves received from the radio device 30, applies rearrangement, based on an interleaving method to n detected first radio wave intensity levels and generates a secret key Ks1 consisting of a bit string, on the basis of n first rearranged radio wave intensity levels. The radio device 30, however, detects n second radio wave intensity levels, corresponding to n second radio waves received from the radio device 10, applies rearrangement, based on the interleaving method to n detected second radio wave intensity levels and generates a secret key Ks2 consisting of the same bit string as the secret key Ks1, on the basis of n second rearranged radio wave intensity levels. COPYRIGHT: (C)2007,JPO&INPIT
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