A novel physical layer error correction and encryption method based on chaotic sequence

摘要

The security of conventional wireless communication mainly depends on the encryption at the upper layers, while the information at the physical layer is not well protected. In this paper, a physical layer error correction and encryption method is proposed. The legitimate transceivers extract the binary secret key from the properties of the wireless channel. And the chaotic sequence and the unit delay function is used to encrypt the channel coding information. The method takes full advantage of the randomness, reciprocity and location sensitivity of the wireless channel and uses those properties to enhance the security of the physical layer information. The results of mathematical analysis and computer simulation show that the cipher text satisfies the national institute of standards and technology (NIST) randomness test and has strong key space and key sensitivity. Compared with the error correction based cipher (ECBC), when the bit error rate (BER) is 10-4, the reliability of the proposed method increases 1dB.