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Cooperation between wireless network nodes is a promising technique forimproving the physical layer security of wireless transmission, in terms ofsecrecy capacity, in the presence of multiple eavesdroppers. While existingphysical layer security literature answered the question "what are thelink-level secrecy capacity gains from cooperation?", this paper attempts toanswer the question of "how to achieve those gains in a practical decentralizedwireless network and in the presence of a secrecy capacity cost for informationexchange?". For this purpose, we model the physical layer security cooperationproblem as a coalitional game with non-transferable utility and propose adistributed algorithm for coalition formation. Through the proposed algorithm,the wireless users can autonomously cooperate and self-organize into disjointindependent coalitions, while maximizing their secrecy capacity taking intoaccount the security costs during information exchange. We analyze theresulting coalitional structures, discuss their properties, and study how theusers can self-adapt the network topology to environmental changes such asmobility. Simulation results show that the proposed algorithm allows the usersto cooperate and self-organize while improving the average secrecy capacity peruser up to 25.32% relative to the non-cooperative case.

Physical Layer Security: Coalitional Games for Distributed Cooperation