An Investigation of Using Loop-Back Mechanism for Channel Reciprocity Enhancement in Secret Key Generation

Peng, L ORCID: 0000-0001-5859-7119, Li, G ORCID: 0000-0003-1145-1168, Zhang, J ORCID: 0000-0002-3502-2926, Woods, R ORCID: 0000-0001-6201-4270, Liu, M and Hu, A ORCID: 0000-0002-0398-4899 (2019) An Investigation of Using Loop-Back Mechanism for Channel Reciprocity Enhancement in Secret Key Generation IEEE Transactions on Mobile Computing, 18 (3). pp. 507-519. ISSN 1536-1233, 1558-0660

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Abstract

Physical layer security key generation exploits unpredictable features from wireless channels to achieve high security, which requires high reciprocity in order to set up symmetric keys between two users. This paper investigates enhancing the channel reciprocity using a loop-back scheme with multiple frequency bands in time-division duplex (TDD) communication systems, in order to mitigate the effect of hardware fingerprint interference and synchronization offset. The scheme is evaluated to be robust to passive eavesdropping and active Man-in-the-Middle attack through both theoretical analyses and practical measurements. A secret key generation protocol is subsequently designed. The performance of the proposed secret key generation method is then evaluated through both numerical simulation and experiments. Results demonstrate that the proposed scheme can effectively mitigate non-reciprocity and outperforms the classical TDD scheme in both key disagreement rate and key generation rate.

Item Type:	Article
Uncontrolled Keywords:	Channel reciprocity, channel state information, hardware fingerprint, physical layer security, secret key generation, loop-back transmission, OFDM, USRP
Depositing User:	Symplectic Admin
Date Deposited:	04 Jun 2018 10:00
Last Modified:	22 Jan 2026 07:56
DOI:	10.1109/TMC.2018.2842215
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3022119
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