摘要
正交频分复用(OFDM)已被广泛应用于无线通信系统,其数据传输安全具有一定的实际意义。该文提出了一种双重加密方案,采用神经网络生成置乱矩阵实现第1次加密,通过基于Logistic映射与Sine映射的复合离散混沌系统产生的混沌序列进行第2次加密。该双重加密方案极大提升了OFDM通信系统的保密性,可以有效地防止暴力攻击。相比于单一的1维Logistic映射的混沌系统,基于Logistic映射与Sine映射的复合离散混沌系统具有更大的密钥空间。该文运用Lyapunov指数与NIST测试验证了该混沌系统的混沌特性及随机性,并仿真验证了双重加密方案的保密性能。仿真结果表明,该文所提出的加密方案密钥空间为4×1093,Lyapunov指数提高到0.9850,NIST测试中最大P值为0.9995。该双重加密方案可在不影响传输性能下极大提升OFDM通信系统的安全性。
Orthogonal Frequency Division Multiplexing(OFDM) is widely used in wireless communication systems, and its data transmission security has certain practical significance. A double encryption scheme is proposed which enhances the confidentiality of the OFDM communication system and can prevent brute force attacks significantly. Specifically, the first encryption is achieved by using neural network to generate the scrambling matrix, and the second encryption is implemented by chaotic sequence generating by composite discrete chaotic system based on Logistic mapping and Sine mapping. Moreover, it has larger secret key space compared with the single one-dimensional Logistic mapping chaotic system. The performance of double encryption is measured by verifying its chaotic characteristics and randomness(Lyapunov exponent and NIST)as well as its security performance in simulation. The results show that Lyapunov index is increased to 0.9850,and the maximum P-value in the NIST test is 0.9995 by using the proposed double encryption in this paper. It indicates such double encryption significantly improve the confidentiality of the OFDM communication system without affecting the transmission performance.
作者
肖成龙
孙颖
林邦姜
汤璇
王珊珊
张敏
谢宇芳
戴玲凤
骆佳彬
XIAO Chenglong;SUN Ying;LIN Bangjiang;TANG Xuan;WANG Shanshan;ZHANG Min;XIE Yufang;DAI Lingfeng;LUO Jiabin(School of Software,Liaoning Technical University,Huludao 125105,China;Quanzhou Institute of Equipment Manufacturing,Haixi Institutes,Chinese Academy of Sciences,Quanzhou 362200,China)
出处
《电子与信息学报》
EI
CSCD
北大核心
2020年第3期687-694,共8页
Journal of Electronics & Information Technology
基金
国家自然科学基金(61404069)
辽宁省教育厅一般科研项目(LJYL048)
辽宁省教育厅青年基金(LJ2017QL033)~~
关键词
保密通信
正交频分复用
复合离散混沌系统
神经网络
NIST测试
Secure communication
Orthogonal Frequency Division Multiplexing(OFDM)
Composite discrete chaotic system
Neural networks
NIST test
