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BBBSS protocol and BCH code combined secret key generation part reconciliation method

A technology of BCH code and key generation, applied in key distribution, can solve the problem of high complexity of error correction coding and decoding, and achieve the effects of low computational complexity, low information leakage rate, and reduced computational load.

Active Publication Date: 2019-07-30
SOUTHEAST UNIV
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Problems solved by technology

The decoding complexity of error correction coding is high, and it is not suitable for resource-constrained key generation scenarios

Method used

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  • BBBSS protocol and BCH code combined secret key generation part reconciliation method

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Embodiment Construction

[0026] The generation key part reconciliation method of combining BBBSS protocol and BCH code of the present invention, such as figure 1 shown, including the following steps:

[0027] (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 according to the received pilot signals respectively.

[0028] Wherein, A and B may be defined as legal communication parties in the OFDM system, that is, the first communication party and the second communication party. First, A and B respectively send known pilot vectors S to each other on the agreed frequency band to obtain channel estimation results. definition and are respectively the frequency impulse responses on the lth subcarrier detected by A and B according to the channel estimation method at the tth moment, and the frequency impulse responses of all subcarriers at the same moment constitute the channel s...

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Abstract

The invention discloses a BBBSS protocol and BCH code combined secret key generation part reconciliation method, which comprises the following steps: (1) two communication parties mutually sending known pilot signals on the same frequency band, and obtaining channel state information at the same moment through channel estimation; (2) the two communication parties pre-processing and quantifying the channel state information respectively, and a result being used as an initial secret key; (3) the two communication parties estimating the inconsistency rate of the initial keys according to the received pilot signals, and performing information reconciliation and grouping; (4) the two communication parties adopting a BBSS protocol to carry out partial reconciliation on the initial secret key based on the grouping condition in the step (3) to obtain a partial reconciliation secret key; (5) the communication party using the BCH code to carry out error correction coding on the part of the harmonic key, sending the BCH syndrome to the other party, and the other party carrying out error correction on the part of the harmonic key through the BCH syndrome; and (6) the two communication partiesperforming privacy amplification on the error-corrected harmonic key, and then performing consistency verification to obtain a shared key. The method is low in calculation complexity and fewer in 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
CPCH04L9/0838H04L9/0861
Inventor 李古月胡爱群张喆颖
Owner SOUTHEAST UNIV
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