OFDM-PON系统中基于混沌的细胞自动机加密算法  

Security enhanced encryption algorithm based on chaos-based cellular automaton for OFDM-PON system

作　　者：卓先好 楼丁溧 毕美华[1,2] 胡志蕊 ZHUO Xianhao;LOU Dingli;BI Meihua;HU Zhirui(School of Communication Engineering,Hangzhou Dianzi University,Hangzhou ZheJiang 310018,China;State Key Laboratory of Advanced Optical Communication System and Networks,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018 [2]上海交通大学光纤区域网与新型光通信系统国家重点实验室,上海200240

出　　处：《杭州电子科技大学学报（自然科学版）》2021年第2期40-47,62,共9页Journal of Hangzhou Dianzi University：Natural Sciences

基　　金：浙江省自然科学基金资助项目(LY20F050004);浙江省教育厅科研资助项目(Y201840746)。

摘　　要：针对正交频分复用无源光网络(Orthogonal Frequency Division Multiplexing Passive Optical Network,OFDM-PON)系统中的数据传输安全问题,提出一种基于混沌序列的细胞自动机(Cellular Automaton,CA)安全性增强方案。首先,利用混沌序列在初等细胞自动机(Elementary Cellular Automaton,ECA)集合中随机选取,基于ECA周期性边界条件,将明文注入到ECA中进行随机状态转移实现异或加密;然后,使用二维细胞自动机(Two-Dimension Cellular Automaton,2DCA)的状态转移规则实现频域上相邻正交幅度调制(Quadrature Amplitude Modulation,QAM)符号的混乱扩散,以抵抗选择明文攻击(Chosen Plaintext Attack,CPA);最后,将混沌序列插入OFDM信号中以实现系统的定时同步和加密。实验结果表明,该方案通过CA状态转移具有良好的混乱和扩散性,可实现动态密文来抵抗CPA,且通过ECA和2DCA的双重加密能够生成大小约1055的密钥空间,为数据传输提供良好的保密性。To effectively solve the data transmission security problem in Orthogonal Frequency Division Multiplexing-Passive Optical Network(OFDM-PON)system,this paper proposes a security enhancement scheme based on cellular automata(CA)and chaotic sequence.Firstly,the chaotic sequence is employed to select several Elementary Cellular Automata(ECA)randomly.Based on the ECA periodic boundary conditions,plaintext is injected into ECA to implement XOR encryption hence achieving random state transition.Then,the state transition rule of Two-dimensional Cellular Automata(2DCA)is employed to achieve chaotic diffusion among adjacent QAM symbols in the frequency domain which can resist Chosen-plaintext Attacks(CPAs).Finally,the chaotic sequence is inserted into the OFDM signal to achieve timing synchronization and encryption.Experimental results show that the security enhancement scheme based on cellular automata performs well in data confusion and diffusion through CA state transition,which can generate dynamic ciphertext to resist chosen-plaintext attacks.And the double encryption mechanism implemented by ECA and 2DCA can create a key space of 1055,which provides good confidentiality for transmission to resist violent attacks.

关 键 词：正交频分复用无源光网络 细胞自动机 混沌加密 

分 类 号：TN918.4[电子电信—通信与信息系统]