关键词: 明文密文对攻击, 物理层安全, 迭代插值加密, 正交频分复用

Abstract: In this paper, a physical layer security algorithm combined with OFDM modulation is proposed, in order to overcome the disadvantages of the existing physical layer security algorithms which can not resist plaintext cipher-text attack. The modulation process is controlled by a secret key, namely the iterative interpolation of the IFFT input symbols. Theoretical analysis and simulation results have showed that the algorithm not only has a large key space, but also can resist plaintext cipher-text attack. With almost no obviously impact on the original system performance except for a small PAPR increase, the proposed algorithm has great encryption effect and anti-attack ability, which shows a high security.

Key words: plaintext cipher-text attack, physical layer security, iterative interpolation encryption, Orthogonal Frequency Division Multiplexing（OFDM）