摘要
针对正交频分复用无源光网络(OFDM-PON)中静态密钥产生的风险,提出一种以信道相位信息作为动态密钥的物理层混沌加密方案。通信双方在相干时间内估计上下行信道相位,得到混沌密钥初值;利用一维混沌系统生成的混沌密钥流对下行数据进行异或(XOR)加密和解密。该方案所得到的动态密钥随着时间的改变而不断更新,因此物理层的安全性能得到提升。实验结果表明,速率为3.625 Gb/s的16QAM的光OFDM信号经长度为25 km标准单模光纤(SSMF)传输后,通信双方的密钥具有良好的一致性,密钥空间达到1015,系统传输的安全性得到有效增强,可成功阻止非法用户对传输数据的窃听。
Aiming at the risks arising from the static keys in an orthogonal frequency division multiplexing passive optical network(OFDM-PON), this study proposes a physical-layer chaotic encryption scheme using channel phase information as dynamic keys. In the coherence time, the initial values of chaotic keys can be extracted from the uplink and downlink channel phases, which are estimated using communication sides. The downlink data is encrypted and decoded by applying XOR operations with the chaotic key stream generated by a one-dimensional chaotic system. The dynamic key obtained using the proposed scheme can be continuously updated with the change of time, further improving the security performance of the physical layer. The experimental results demonstrate that the keys of both communication sides have a good consistency subsequent to the 16-quadrature-amplitude-modulation(16 QAM) optical OFDM signal with a speed of 3.625 Gb/s passing through the standard single-mode fiber(SSMF) with a length of 25 km. The key space of the proposed encryption scheme reaches 1015, enhancing the security of system transmission and effectively preventing illegal users from eavesdropping.
作者
李春华
吴雅婷
余衍
张倩武
孙彦赞
王涛
Li Chunhua;Wu Yating;Yu Yan;Zhang Qianwu;Sun Yanzan;Wang Tao(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China;Shanghai Institute for Advanced Communication&Data Science,Shanghai 200444,China;Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,Shanghai 200444,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2020年第10期51-57,共7页
Acta Optica Sinica
基金
国家自然科学基金(61420106011,61601279,61601277,61635006,61671011,61501289)
上海市科学发展基金(17010500400,16511104100)。
关键词
光通信
正交频分复用无源光网络
信道
动态密钥
加密
optical communications
orthogonal frequency division multiplexing passive optical network
channel
dynamic key
encryption
