无轮廓像干扰光学加密系统

巩琼; 秦怡; 杨兴强; 吕晓东

doi:doi:10.3969/j.issn.1003-501x.2012.12.019

光电工程, 2012, 39 (12): 116, 网络出版: 2012-12-14

无轮廓像干扰光学加密系统

Optical Image Encryption with Silhouette Removal

论文大纲

巩琼 ^*秦怡杨兴强吕晓东

作者单位

南阳师范学院物理与电子工程学院，河南南阳 473061

图像加密非相干叠加轮廓像问题暴力攻击 image encryption non coherent superposition silhouette problem brute force attack

摘要

提出了一种基于光波非相干叠加原理的光学加密系统。该光学加密系统采用将图像信息隐藏于三个随机相位板中，其中一个随机相位板使用计算机生成，另外两个通过相位恢复方法得到。解密时，使用不同波长的光波照射由这三个随机相位板构成的两组随机相位板，并通过分束镜将两个衍射场进行非相干叠加，叠加后干涉场的强度即为原始图像，可以采用 CCD等图像传感器件直接记录。本方法不但系统对于暴力攻击具有鲁棒性，也消除了先前提出的基于干涉原理光学加密方法存在的“轮廓像”问题，具有较高的安全性。计算机模拟结果证实了本方法的有效性。

Abstract

A novel optical encryption system based on non coherent superposition is proposed. In this system, the original image is hidden into three Phase Only Masks (POMs). One of the phase masks is generated by computer while another two are obtained analytically. For decryption, the diffraction filed of the three POMs is superposed by utilizing the beam splitters. The intensity of the superposition field, which is exactly the original image, could be recorded by CCD camera. Compared with the earlier interference-based method, our approach is simple and easy to be realized by optical elements. Moreover, the silhouette problem existing in the earlier method with two POMs can be resolved in our method, thus the security of the method is further improved. Simulation results are presented to verify the validity of the proposed approach.

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巩琼, 秦怡, 杨兴强, 吕晓东. 无轮廓像干扰光学加密系统[J]. 光电工程, 2012, 39(12): 116. GONG Qiong, QIN Yi, YANG Xing-qiang, Lü Xiao-dong. Optical Image Encryption with Silhouette Removal[J]. Opto-Electronic Engineering, 2012, 39(12): 116.

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