Multiple-image optical encryption: an improved encoding approach.
Multiple-image optical encryption: an improved encoding approach.
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DOI：
10.1364/ao.48.002686
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发表时间：
2009-05
期刊：
影响因子：
1.9
通讯作者：
Xiao Yong-liang;Zhou. Xin;Yuan Sheng;Liu Qiang;Li Yang-Cong
中科院分区：
文献类型：
--
作者：
Xiao Yong-liang;Zhou. Xin;Yuan Sheng;Liu Qiang;Li Yang-Cong
提出了一种改进的基于级联相位恢复算法（CPRA）的多图像光学加密编码方法。该系统由一个标准4-f相关器的若干级组成，其中的关键不仅是CPRA产生的相位掩模对，而且是前级输出平面的相位分布。讨论了系统的安全性和容量。实验结果表明，该系统能在一定程度上抵抗已知明文攻击，加密容量有较大提高。计算机仿真证明了所提出的思想的有效性。该系统可以使用纯光学架构来实现。
An improved encoding approach to multiple-image optical encryption based on a cascaded phase retrieval algorithm (CPRA) is proposed. The system consists of several stages of a standard 4-f correlator, in which the keys are not only the phase mask pairs produced by CPRA but also the phase distribution of the output plane of the front stage. The security and the capacity of the system are also discussed. Results indicate that the system can resist known-plaintext attack to some extent, and the encrypted capacity is considerably enhanced. Computer simulations have proved the validity of the proposed idea. The system can be implemented using a pure optical architecture.