Performance of Selection cooperation in the presence of a malicious relay

The performance of Selection cooperation in the presence of a malicious relay is analyzed. The malicious relay introduces a new form of Denial of Service (DoS) attack at the physical layer, inhibiting source-destination communication from reaping the diversity and SNR gains produced through cooperation in the network. In this form of DOS attack, the relay does not alter the source information while relaying. From the analysis it is found that in the presence of a malicious relay, Selection cooperation achieves a diversity order of 2 irrespective of the number of relays in the network and the malicious relay position has a significant effect on the performance of the system.