Physical Integrity Check in Cooperative Relay Communications

• Published in: IEEE transactions on wireless communications Vol. 14; no. 11; pp. 6401 - 6413
• Main Author: Kim, Sang Wu
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Complement; Computational efficiency; cooperative relay communications; Cryptography; Decoding; Fading; false data injection attack; Integrity; Likelihood ratio; likelihood ratio test; minmax detection; Optimization; optimum detection; Outages; Physical integrity check; Random variables; Relay; Relays; Reliability; Wireless communication; likelihood ratio test; optimum detection; cooperative relay communications; Physical integrity check; false data injection attack; minmax detection
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2015.2453353

We propose a physical-layer technique for checking the integrity of information provided by an intermediate node (relay) in cooperative relay communication systems. The proposed approach, built on the theory of likelihood ratio test, exploits the physical-layer signal from the source in detecting any data modification (false data injection attack) made by the relay. We present the optimum detection method that minimizes the end-to-end outage probability and the minmax detection method that minimizes the maximum possible outage probability under unknown attack probability. We show that the optimum detection technique can provide almost the same end-to-end outage probability that can be provided by the ideal cryptographic technique that perfectly detects the false injection at the expense of high computational cost and bandwidth overhead. The proposed physical integrity check can be used as an additional layer of protection or can complement to the conventional cryptographic techniques.