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随机偏振光学加密算法的加密及解密特性分析
Characteristic analysis of encryption and decryption in random polarization optical encryption algorithm
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摘要: 为了阐明随机偏振模板在光学加密系统中的作用，采用理论分析与数值模拟相结合的方法，进行了在双随机偏振光学加密系统中偏振模板的特性参量对系统加密效果及解密误差的影响的理论和仿真分析；对比了随机相位模板和随机偏振模板对光学加密系统加密效果及解密误差的不同影响。结果表明，加密方面，采用随机偏振模板或随机相位模板均能生成平稳白噪声分布的密文，但是偏振模板有两个构造参量，密钥空间更大；解密方面，系统对相位模板以及偏振模板中不同参量的解密敏感性有一定差异，随机偏振加密具有更高的应用灵活性。该结果对理解相位及偏振编码光学加密系统的本质属性及设计安全性更高的光学加密系统有一定的帮助。Abstract: To demonstrate the function of random polarization mask in an optical encryption system, the influence of parameters in random polarization mask on encryption effect and decryption error in double random polarization optical encoding system was analyzed by means of theoretical analysis and numerical simulation. The different effects of random phase encoding algorithm and random polarization encoding algorithm on encryption effect and decryption error were compared and presented. The results indicate that a satisfying white-noise liked encrypted image can be obtained when using random phase mask or random polarization mask. But a larger key space is observed with random polarization mask due to its two structured parameters. From decryption point of view, the key sensitivities are different among the different parameters in random polarization mask or random phase mask. The random polarization encoding algorithm has the favorable feasibility for practical application. The results are significant not only for the understanding on the intrinsic of random phase and polarization optical encoding system but also for the design of optical encryption system with high security level.
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