A Perfect Secrecy Communication Scheme Based on Strictly Typical Artificial Noise and Cascaded Secure Codes

This paper proposes a perfect secrecy-achieving scheme for wireless communication systems. Most existing physical layer security schemes can achieve only weak or strong secrecy. One of the main reasons is the uncertainty of the eavesdropping channels. In order to achieve perfect secrecy, we design the artificial noise (AN) as a strictly typical sequence to guarantee that the eavesdropping channel is degraded with probability 1. In addition, a cascaded code is also designed to achieve both reliability and security. Theoretical analysis proves that the proposed scheme can transmit private message with finite code length without any information leakage. Finally, security performance of the proposed scheme is measured and compared with theoretical bounds, and a tradeoff between AN power consumption and decoding threshold is also analyzed numerically.