Lightweight Group Key Distribution Method Based on High Similar Wireless Channel Characteristics
Liangjun Hu, Aiqun Hu, Guyue Li, Congcong Cao · 2018
Physical-layer secret key generation (PSKG) technology based on reciprocal wireless channel has been widely studied in point-to-point (P2P) scenarios as it can effectively solve the key distribution problem in traditional security mechanisms. However, the computation and energy cost of PSKG is high when it is extended to group key distribution. The problem of applying PSKG to ensure group secret communication remains open. In this paper, we propose a lightweight group key distribution (LGKD) method for a star network topology environment. In our proposed method, center node and each child node first extract high correlated channel characteristics instead of generating identical P2P keys, respectively. Then, the group key is broadcasted to each child node protected by the P2P channel characteristics with high similarity. Our simulation results verify the feasibility and effectiveness of our proposed group key distribution method.