Computer Engineering and Applications ›› 2014, Vol. 50 ›› Issue (22): 88-91.

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Algorithm for OFDM physical layer security based on iterative encryption

LIU Sijing, GAO Baojian, WU Qian, ZHAO Xiaoning, CAO Yanjun   

  1. College of Information Science and Technology, Northwest University, Xi’an 710127, China
  • Online:2014-11-15 Published:2014-11-13

基于迭代加密的OFDM系统物理层安全算法

柳斯婧,高宝建,吴  谦,赵小宁,曹艳君   

  1. 西北大学 信息科学与技术学院,西安 710127

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)

摘要: 针对现有的基于OFDM调制的物理层安全算法不能抵抗明文密文对攻击的缺点,提出了一种结合OFDM调制,通过密钥控制调制过程,对IFFT变换前的符号进行迭代插值的物理层安全算法。理论分析和仿真实验表明,算法具有较大的密钥空间,能够抵抗明文密文对攻击。除了峰均比有少量增加外,该算法几乎不改变原系统的性能,具有很好的加密效果和抗攻击能力,表现出较高的安全性。

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