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In this paper, the authors consider a two-way relay network where two sources can communicate only through an un trusted intermediate relay, and investigate the physical layer security issue of this two way relay scenario. Specifically, they treat the intermediate relay as an eavesdropper from which the information transmitted by the sources needs to be kept secret, despite the fact that its cooperation in relaying this information is essential. They indicate that a non-zero secrecy rate is indeed achievable in this two-way relay network even without external friendly jammers. As for the system with friendly jammers, after further analysis, They can obtain that the secrecy rate of the sources can be effectively improved by utilizing proper jamming power from the friendly jammers.
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