1) The document proposes a technique to detect and prevent rogue relay node attacks in 4G multihop wireless networks using a QoS-aware distributed security architecture based on Elliptic Curve Diffie-Hellman (ECDH) algorithm.
2) It generates a 4G multihop WiMAX network and implements ECDH for secure initial connection setup and authentication. It then generates a rogue node attack and uses ECDH's hop-by-hop authentication to detect the rogue node.
3) The architecture prevents the detected rogue node and forwards messages securely to the destination node. It evaluates the scheme's performance on QoS metrics like latency, jitter and packet loss rate.