MIMO transmissions with information-theoretic secrecy for secret-key agreement in wireless networks

Information-theoretic secrecy gives the strongest information security that is important for military wireless networks. In this paper, we show that randomized MIMO transmissions can achieve such secrecy. A method is proposed to randomize the MIMO transmission coefficients. The received signal of the adversary has some special statistical distributions, based on which the indeterminacy of the adversary´s blind deconvolution is proved. Receiving error rates and secret channel capacity are analyzed and simulated. This paper points out a practical way to realize the well-known wire-tap channel for perfect secrecy, which is one of the interesting challenges in information theory. The proposed method is also useful for key management in military wireless networks