Game-theoretic perspective of Ping-Pong protocol

摘要

AbstractWe analyse Ping-Pong protocol from the point of view of a game. The analysis helps us in understanding the different strategies of a sender and an eavesdropper to gain the maximum payoff in the game. The study presented here characterizes strategies that lead to different Nash equilibriums. We further demonstrate the condition for Pareto optimality depending on the parameters used in the game. Moreover, we also analysed LM05 protocol and compared it with PP protocol from the point of view of a generic two-way QKD game with or without entanglement. Our results provide a deeper understanding of general two-way QKD protocols in terms of the security and payoffs of different stakeholders in the protocol.Highlights?A generic game-theoretic perspective of Ping-Pong protocol is proposed.?General two-way QKD protocols with or without entanglement are analysed and compared from the point of view of a game.?A relation between pure strategy Nash equilibrium and payoffs of different stakeholders in the game is established.