Design of an Efficient OFDMA-Based Multi-User Key Generation Protocol

Zhang, J ORCID: 0000-0002-3502-2926, Ding, Ming, Lopez-Perez, David, Marshall, Alan ORCID: 0000-0002-8058-5242 and Hanzo, Lajos
(2019) Design of an Efficient OFDMA-Based Multi-User Key Generation Protocol. IEEE Transactions on Vehicular Technology, 68 (9). 8842 - 8852.

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Secret key generation exploits the unique random features of wireless channels, hence it is eminently suitable for the resource constrained Internet of Things applications. However, it has only been involved for single links between a pair of users, whilst there is a paucity of literature on group and multi-user key generation. This paper proposes an orthogonal frequency-division multiple access (OFDMA)-based multi-user key generation protocol to efficiently establish keys in a star topology. The uplink and downlink multi-user access facilitated by OFDMA allows the central node to simultaneously communicate with multiple users, which can significantly reduce the channel probing overhead. In particular, we provide a compelling case study of multi-user secret key generation by designing a prototype based on IEEE~802.11ax, a new Wi-Fi standard to be released. Our simulation results have demonstrated that the OFDMA-based multi-user key generation protocol incurs low interference amongst the users, whilst benefiting from channel reciprocity and generating unique random keys.

Item Type: Article
Uncontrolled Keywords: Physical layer security, Group key generation, Multi-user key generation, Multi-user access, OFDMA, IEEE 802.11ax
Depositing User: Symplectic Admin
Date Deposited: 12 Jul 2019 09:29
Last Modified: 22 Oct 2021 11:09
DOI: 10.1109/TVT.2019.2929362
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