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This paper describes how eavesdropping can potentially be restrained by introducing cooperative jamming. A wiretap channel of two-way relay with Analog Network Coding (ANC) is considered, in which a transmitter sends message to its intended receiver in the presence of a passive eavesdropper and with the help of an active jammer. The eavesdropper, who does not know the interfering message from the cooperative jammer, is confused to extract the useful information. The achievable secrecy rates are given, and by numerical analysis, it can be increased effectively by cooperative jamming. Though it harms the achievable rate of main source-destination channel simultaneously, considering the better improvement of achievable secrecy rate, the loss is valuable and acceptable.
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