Encrypted polar codes for wiretap channel

The wiretap channel proposed by Wyner is an important model of physical layer for security, where the channel between legal users (Alice and Bob) is called the main channel and the channel between eavesdropper and legal users is called eavesdropping channel. The channel coding technique has proven to good means to ensure the security of the Wyner wiretap channel. Recently, polar codes attract a lot of attentions due to their capacity-achieving property. In this paper, we propose a novel construction method for achieving more large secrecy capacity of wiretap channel with polar codes. In the scheme, we integrate encryption algorithm to the construction of polar code and prove the validity, reliability, and security of the proposed scheme in theory. Later, we present the transmission rate of the scheme by numerical simulations. The numerical simulation results show that the secrecy transmission rate can be improved significantly and a larger secrecy transmission rate could be achieved by the proposed scheme.