Enhanced secure strategy for electro-optic chaotic systems with delayed dynamics by using fractional Fourier transformation.
Enhanced secure strategy for electro-optic chaotic systems with delayed dynamics by using fractional Fourier transformation.
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DOI：
10.1364/oe.22.005241
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发表时间：
2014-03
期刊：
影响因子：
3.8
通讯作者：
M. Cheng;L. Deng;Hao Li;Deming Liu
中科院分区：
文献类型：
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作者：
M. Cheng;L. Deng;Hao Li;Deming Liu
提出了一种利用时间域分数傅立叶变换(FRFT)对电光振荡器产生的光学混沌载波进行后处理的方案。当满足一定条件时，FRFT成功地屏蔽了时滞动态的时延特征。同时，增加了物理参数的维度空间。引入了低比特率(数百Mbps)的伪随机二进制序列(PRBS)来控制FRFT的参数。混沌光载波、FRFT参数和伪随机序列相互覆盖，使得窃听者必须搜索整个密钥空间才能破解系统。该方案可以在不修改混沌源的情况下，提高基于时延动态的通信系统的安全性。这样，基于混沌的通信系统的设计就可以以模块化的方式实现。
We propose a scheme whereby a time domain fractional Fourier transform (FRFT) is used to post process the optical chaotic carrier generated by an electro-optic oscillator. The time delay signature of the delay dynamics is successfully masked by the FRFT when some conditions are satisfied. Meanwhile the dimension space of the physical parameters is increased. Pseudo random binary sequence (PRBS) with low bit rate (hundreds of Mbps) is introduced to control the parameters of the FRFT. The chaotic optical carrier, FRFT parameters and the PRBS are covered by each other so that the eavesdropper has to search the whole key space to crack the system. The scheme allows enhancing the security of communication systems based on delay dynamics without modifying the chaotic source. In this way, the design of chaos based communication systems can be implemented in a modular manner.