Achievable Secrecy Rates In The Multiple Access Wiretap Channel With Deviating Users
2016 IEEE International Symposium on Information Theory (ISIT)(2016)
摘要
We consider the multiple access wiretap channel (MAC-WTC), where multiple legitimate users wish to have secure communication with a legitimate receiver in the presence of an eavesdropper. The exact secure degrees of freedom (s.d.o.f.) region of this channel is known. Achieving this region requires users to follow a certain protocol altruistically and transmit both message-carrying and cooperative jamming signals in an optimum manner. In this paper, we consider the case when a subset of users deviate from this optimum protocol. We consider two kinds of deviation: when some of the users stop transmitting cooperative jamming signals, and when a user starts sending intentional jamming signals. For the first scenario, we investigate possible responses of the remaining users to counteract such deviation. For the second scenario, we use an extensive-form game formulation for the interactions of the deviating and well-behaving users. We prove that a deviating user can drive the s.d.o.f. to zero; however, the remaining users can exploit its intentional jamming signals as cooperative jamming signals against the eavesdropper and achieve an optimum s.d.o.f.
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关键词
achievable secrecy rates,multiple access wiretap channel,MAC-WTC,multiple legitimate users,secure communication,legitimate receiver,eavesdropper,secure degrees of freedom region,sdof region,message-carrying signal transmission,cooperative jamming signal transmission,deviating users,optimum protocol,intentional jamming signals,extensive-form game formulation,well-behaving users
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