Reduce impact of false detection of adversary states on the secure cooperative network

This paper investigates the problem of power allocation, in the presence of a malicious adversary. For this scenario, we consider a source, a destination and full-duplex (FD) relay, that receives private messages and transmits jamming signals on the same time and frequency band. In this system model, we assume the adversary can jam legitimate link or eavesdrop the private message, and benefit from maximal ratio combining (MRC) technique. Since the global channel state information (CSI) is available for adversary, it can choose between eavesdropping or jamming modes, such that the final achievable rate in the legitimate destination is minimized. As in practice, the adversary hides its mode from legitimate source, adversary's mode detection is so challenging. To tackle this issue, we propose an approach that decreases destructive effects of adversary's mode false detection on secrecy rate. Simulation results show, when adversary is passive, adversary's mode false detection decreases secrecy rate 51% and when it is active, false detection decreases secrecy rate 92%, while if is benefited from proposed approach, secrecy rate decreases 10% and 66%, respectively.