Research on Quantization Method of Reducing Bit Disagreement Rate in Secret Key Extraction

doi:10.3969/j.issn.1671-1122.2017.04.007

Abstract

Abstract:

In the existing PHY key extraction method based on wireless radio channel characteristics, the measurements which near to a threshold are likely to be quantized to the sides of the threshold in high probability at two legitimate nodes, resulting in bit disagreement in generated secret key. In order to solve this problem, this paper proposes an adaptive channel quantization with guard-band (ACQG) method, which can reduce the bit disagreement rate in generated secret key by adaptively modifying the measurements which located in the guard-band. In order to further improve the bit agreement in generated key, this paper proposes a modified adaptive channel quantization (MACQ) method based on ACQG. Simulation results show that, compared with the traditional key extraction algorithm, the proposed methods can improve the rate of key extraction and bit agreement in generated key effectively.

Key words: key extraction, quantization with guard-band, rate of key extraction, bit agreement, adaptive channel quantization

CLC Number:

TN918.82

Shunan SONG, Zhen YANG. Research on Quantization Method of Reducing Bit Disagreement Rate in Secret Key Extraction[J]. Netinfo Security, 2017, 17(4): 46-52.

Figures/Tables 6

References 18

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