DOPLE: A Double Protective Physical Layer Encryption Scheme for OFDM Systems

Abstract

In the era of wireless communication, the security of transmission, especially physical layer security, has become a big concern. In this paper, we propose an efficient physical layer encryption scheme for the OFDM based wireless systems. The scheme employs the time domain encryption to protect the entire physical layer frame in two steps. First, transmitted data in Presentation Protocol Data Unit (PPDU) is protected with an iterative encryption algorithm that can effectively deal with known plaintext and ciphertext attacks. Second, Long Training Sequence (LTS) is also encrypted to prevent the adversary from performing correct channel synchronization. We analyze the security of the proposed scheme under different attack scenarios, and evaluate the performance of our scheme with the simulation experiments.