MIMO Based Enhancement for Wireless Communication Security

Abstract

Using channel state information (CSI) as the secret key in multiple-inputmultiple-output (MIMO) links is another approach to guarantee low probability of interception (LPI) and realize physical layer (PHY) security techniques. However, the information-theoretic security is an average-information measure. The system can be designed and tuned for a specific level of security e.g., with very high probability a block is secure, but it may not be able to guarantee security with probability 1. The security in classical cryptography system is based on unproven assumptions regarding the hardness of certain computational tasks, therefore, systems are insecure if assumptions are wrong or if efficient attacks are developed. But the classical cryptography system can permit secure with probability 1 under some computing time and resource constraints.