Secret key generation strategy based on broadband channel state information
LI Tao1,2, LUAN Fengyu3, ZHOU Shidong1,2
1. State Key Lab on Microwave and Digital Communications, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China;
2. National Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, China;
3. State Grid Information & Telecommunication Branch, Beijing 100761, China
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.
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2017, Vol. 57 
