A Practical Secret Key Generation Scheme Based on Wireless Channel Characteristics for 5G Networks

Qiuhua WANG  Mingyang KANG  Guohua WU  Yizhi REN  Chunhua SU  

IEICE TRANSACTIONS on Information and Systems   Vol.E103-D   No.2   pp.230-238
Publication Date: 2020/02/01
Publicized: 2019/10/16
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2019INI0001
Type of Manuscript: Special Section PAPER (Special Section on Security, Privacy, Anonymity and Trust in Cyberspace Computing and Communications)
Category: Network Security
secret key generation,  physical-layer security,  channel reciprocity,  information reconciliation,  privacy amplification,  

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Secret key generation based on channel characteristics is an effective physical-layer security method for 5G wireless networks. The issues of how to ensure the high key generation rate and correlation of the secret key under active attack are needed to be addressed. In this paper, a new practical secret key generation scheme with high rate and correlation is proposed. In our proposed scheme, Alice and Bob transmit independent random sequences instead of known training sequences or probing signals; neither Alice nor Bob can decode these random sequences or estimate the channel. User's random sequences together with the channel effects are used as common random source to generate the secret key. With this solution, legitimate users are able to share secret keys with sufficient length and high security under active attack. We evaluate the proposed scheme through both analytic and simulation studies. The results show that our proposed scheme achieves high key generation rate and key security, and is suitable for 5G wireless networks with resource-constrained devices.