Fu Shiming, Ling Tong, Yang Jun, Li Yong
School of Artificial Intelligence, Chongqing University of Education, Chongqing 400065, China.
School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China.
Entropy (Basel). 2024 Sep 4;26(9):758. doi: 10.3390/e26090758.
This paper explores physical layer group key generation in wireless relay networks with a star topology. In this setup, the relay node plays the role of either a trusted or untrusted central node, while one legitimate node (Alice) acts as the reference node. The channel between the relay and Alice serves as the reference channel. To enhance security during the channel measurement stage, a cooperative jamming-based scheme is proposed in this paper. This scheme allows the relay to obtain superimposed channel observations from both the reference channel and other relay channels. Then, a public discussion is utilized to enable all nodes to obtain estimates of the reference channel. Subsequently, the legitimate nodes can agree on a secret key (SK) that remains secret from the eavesdropper (Eve), or a private key (PK) that needs to be secret from both the relay and Eve. This paper also derives the lower and upper bounds of the SK/PK capacity. Notably, it demonstrates that there exists only a small constant difference between the SK/PK upper and lower bounds in the high signal-to-noise ratio (SNR) regime. Simulation results confirm the effectiveness of the proposed scheme for ensuring security and efficiency of group key generation.
本文探讨了具有星型拓扑结构的无线中继网络中的物理层组密钥生成。在这种设置中，中继节点充当可信或不可信的中心节点，而一个合法节点（爱丽丝）充当参考节点。中继与爱丽丝之间的信道用作参考信道。为了在信道测量阶段增强安全性，本文提出了一种基于协作干扰的方案。该方案允许中继从参考信道和其他中继信道获得叠加的信道观测值。然后，利用公开讨论使所有节点能够获得参考信道的估计值。随后，合法节点可以就对窃听者（伊芙）保密的秘密密钥（SK），或对中继和伊芙都保密的私有密钥（PK）达成一致。本文还推导了SK/PK容量的上下界。值得注意的是，它表明在高信噪比（SNR）情况下，SK/PK上下界之间仅存在一个小的常数差异。仿真结果证实了所提方案对于确保组密钥生成的安全性和效率的有效性。
