利用部分密文恢复明文的光学加密系统  

Optical Encryption System Based on Using Part of Ciphertext to Restore Plaintext

作　　者：吕晓东[1] 刘红钊[1] 马毛粉[1] 秦怡[1] 

机构地区：[1]南阳师范学院机电工程学院,河南南阳473061

出　　处：《激光杂志》2016年第5期32-36,共5页Laser Journal

基　　金：国家自然科学基金(61505091);河南省科技厅基础与前沿计划项目(142300410454);南阳师范学院青年基金(QN2015013);南阳师范学院高层次人才科研启动基金(nytc2006k100)

摘　　要：针对光学加密系统中密文及密钥体积庞大,传输与保存不便,本文提出了一种改进的高效率光学加密系统。该系统加密过程同经典的双随机相位加密系统,为了减小密钥体积,加密时所需的两块随机相位板由时空混沌系统生成。同时,提出的解密过程只需半幅密文可完全恢复明文。仿真分析了利用部分密文恢复整幅灰度图像的解密效果,结果证明了所提方法的有效性。此外,对加密系统容量和系统安全性进行了仿真分析,结果表明本文提出的加密系统容量大,密钥和密文体积小,密钥空间大,安全性高。In view of large volume of ciphertext and key causing low transmission efficiency and inconvenience of reserve,in this paper an improved efficient optical encryption system is proposed.The encryption process is the same as the classic double random phase encoding（ DRPE） system. But in order to reduce the key volume,the random phase masks in DRPE system are generated by chaotic system.Meanwhile,during the proposed decryption process,the plaintext can be restored by using only half of the ciphertext.The simulations are performed on analysis of the effect of decryption by using part of the ciphertext to restore the whole grayscale image.The results demonstrate the feasibility and effectiveness of the proposed method.In addition,through simulation,the capacity and security of encryption system are analyzed.The results show that the proposed encryption system has a large capacity,small volume of ciphertext and key,and high security.

关 键 词：傅里叶光学 图像加密 迭代恢复算法 混沌映射 随机相位板 

分 类 号：TN911.74[电子电信—通信与信息系统]