A partial reconciliation method for key generation combining bbbss protocol and bch code

Abstract

The invention discloses a partial reconciliation method for key generation combined with the BBBSS protocol and the BCH code, including: (1) both communication parties send known pilot signals to each other on the same frequency band, and obtain channel state information at the same time through channel estimation ; (2) The communication parties preprocess and quantify the channel state information respectively, and use the result as the initial key; (3) The communication parties estimate the inconsistency rate of the initial key according to the received pilot signal, and perform information reconciliation and grouping; (4) Based on the grouping situation in step (3), the two parties in the communication use the BBBSS protocol to partially reconcile the initial key to obtain a partial reconciliation key; (5) the communication party uses the BCH code to perform error correction encoding on the partial reconciliation key, Send the BCH syndrome to the other party, and the other party uses the BCH syndrome to correct part of the reconciliation key; (6) The communication parties perform privacy amplification on the reconciliation key after error correction, and then perform consistency verification to obtain the shared secret key. key. The present invention has low calculation complexity and less interaction times.

Description

technical field

[0001] The present invention The present application relates to the field of wireless communication and information encryption, and in particular to the part combining the reconciliation protocol and the error correction coding in the information reconciliation of key generation. Background technique

[0002] In wireless communication, at the same time and at the same frequency point, the multipath properties (gain, frequency offset, delay) of the wireless channel are the same for both the sender and receiver, that is, the fading experienced by the signal on the uplink and downlink channels is theoretically consistent. Therefore, in a TDD system, when the uplink and downlink switching rate is fast enough, that is, the duplex time interval is much smaller than the channel coherence time, the wireless uplink and downlink channel gains are highly reciprocal. In addition, the randomness, fast time-varying, and fast space-varying properties of wireless channels pr...

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