Abstract
The secret group key generation based on physical layer security and information theory security has attracted increasing research interest. In this paper, we propose a scheme to establish the secret group key with the cooperation of all the nodes. To ensure the security of the group communication, a protocol is proposed to implement the collaborative secret group key via circle network topology. We subsequently analyze the achievable theoretical upper bound of the secret group key rate for circle topology in the presence of an eavesdropper. The simulation result shows that the protocol doesn't only assign the computation and broadcast to each node, but also obviously increase the group key generation rate than a benchmark scheme. We further analyze the impact of node number and SNR on the achievable secrecy rate.
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