SUMMARYAs a measure for preventing eavesdropping on landmobile communication, this paper studies an application of a private key agreement based on the propagation characteristics of channel to a practical system without key delivery. The paper proposes a private key agreement based on the time-varying frequency characteristics suitable for OFDM. In the proposed method, the time-varying frequency characteristics are alternately measured on the basis of the channel reciprocity and generation of the key and key…
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