Research Article
Beam-Based Secure Physical Layer Key Generation for mmWave Massive MIMO System
@INPROCEEDINGS{10.1007/978-3-030-67720-6_3, author={Hao Gao and Yanling Huang and Danpu Liu}, title={Beam-Based Secure Physical Layer Key Generation for mmWave Massive MIMO System}, proceedings={Communications and Networking. 15th EAI International Conference, ChinaCom 2020, Shanghai, China, November 20-21, 2020, Proceedings}, proceedings_a={CHINACOM}, year={2021}, month={2}, keywords={Physical layer security Beam management MIMO Secret key generation Huffman coding}, doi={10.1007/978-3-030-67720-6_3} }- Hao Gao
Yanling Huang
Danpu Liu
Year: 2021
Beam-Based Secure Physical Layer Key Generation for mmWave Massive MIMO System
CHINACOM
Springer
DOI: 10.1007/978-3-030-67720-6_3
Abstract
Massive MIMO system greatly enriches the randomness of the secret keys in the physical layer and increases the rate of key generation. However, it is not practical to obtain full channel state information for key generation in actual communication scenarios due to a large number of additional signaling overhead. In this paper, we proposed a feasible physical layer key generation scheme by using the beam information as a random source. The procedure for key generation is designed based on the current beam management mechanism in 5G NR. Therefore, the secret key is synchronously generated in the process of two-stage beam search between the gNB and the UE before data transmission, and the additional signaling overhead for key generation is little. Furthermore, to cope with the non-uniform distributed characteristics of the beams, we adopt Huffman code in the encoding of the beam index, thereby improving the efficiency of the key generation. Simulation results show that the proposed scheme can achieve mutual information per bit as high as 0.97, which is 2% to 3% better than that of equal length coding. Furthermore, the bit disagreement rate can be less than 1% in a harsh communication environment with a signal-to-noise ratio of −10 dB.
