Secret key generation strategy based on broadband channel state information

LI Tao; LUAN Fengyu; ZHOU Shidong

doi:10.16511/j.cnki.qhdxxb.2017.25.038

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Journal of Tsinghua University(Science and Technology) ›› 2017, Vol. 57 ›› Issue (10) : 1009-1013. DOI: 10.16511/j.cnki.qhdxxb.2017.25.038

COMPUTER SCIENCE AND TECHNOLOGY

Secret key generation strategy based on broadband channel state information

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Abstract

The channel information for a large number of frequency points in broadband communication systems can be used as a random source to generate secret keys, thereby, enhancing system security. However, there is a limited number of multipaths in the scattering and there is a correlation between different frequency points. Thus, for the condition that the total transmission power is limited, the power allocation strategy for different frequency points will affect the secret key security. A power allocation model is given with the key generation rate as a measure of the security that maximizes the key generation rate. The model is solved with the Lagrange multiplier method. A suboptimal power allocation method is given to reduce the calculation complexity that compares with the optimal solution with the sequential quadratic programming (SQP) algorithm. Numerical tests show that the security with the suboptimal power allocation strategy is quite close to the security with the SQP algorithm which is considered to be the optimal strategy.

Key words

secret key rate / power allocation / Lagrange multiplier method / suboptimal algorithm / sequential quadratic programming (SQP)

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LI Tao, LUAN Fengyu, ZHOU Shidong. Secret key generation strategy based on broadband channel state information[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(10): 1009-1013 https://doi.org/10.16511/j.cnki.qhdxxb.2017.25.038

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