A New Low-BMR Quantization Method for Wireless Channel Characteristics-based Secret Key Generation

• Qiuhua Wang,
• Qiuyun Lyu,
• Xiaojun Wang,
• Jianrong BAO,

Vol. 11, No. 10, October 30, 2017
10.3837/tiis.2017.10.021, Download Paper (Free):

• secret key generation
• Physical-layer security
• channel reciprocity
• quantization
• Information reconciliation
• Privacy amplification

Abstract

Channel characteristics-based secret key generation is an effective physical-layer security method. The issues of how to remove the effect of random noise and to balance the key generation rate (KGR) and the bit mismatch rate (BMR) are needed to be addressed. In this paper, to reduce the effect of random noise and extract more secret bits, a new quantization scheme with high key generation rate and low bit mismatch rate is proposed. In our proposed scheme, we try to use all measurements and correct the differences caused by noise at the boundary regions instead of simply dropping them. We evaluate and discuss the improvements of our proposed scheme. The results show that our proposed scheme achieves lower bit mismatch rate as well as remaining high key generation rate.

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