Radio communications system

Details Radio communications system Radio communications system

2004-02-25

2009-12-15

Vu, Kimyen (Department: 2435)

Cryptography

Key management

Having particular key generator

C380S047000, C455S410000, C455S411000

Reexamination Certificate

active

07634088

ABSTRACT:
A radio communications system includes radio devices, and antenna and an array antenna. The radio devices communicate a prescribed signal via the antenna and the array antenna in a system of transmission and reception at a single frequency, such as time division duplex, as the array antenna changes the in directivity to form a plurality of directivities. The radio devices detect a plurality of received radio waves' strength to produce receive signal profiles, respectively, indicating a plurality of strength profiles. The radio devices multivalue strength of the receive signal profiles, respectively, and generate private keys having the multivalued plurality of values serving as a bit pattern.

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