线性移位寄存器在图像加密中的应用  

The Application in Image Encryption by Line Feedback Shift Register

作　　者：荆锐 朱平[2] 杨恒欢 冯涛[2] 

机构地区：[1]上海中新科技管理学院计算机系,上海200023 [2]上海第二工业大学成人与继续教育学院,上海200041

出　　处：《上海第二工业大学学报》2011年第4期293-297,共5页Journal of Shanghai Polytechnic University

摘　　要：图像加密技术作为数字信息保护的一种有效手段,随着信息技术的发展,人们对其安全性的要求越来越高。讨论了关于线性移位寄存器(LFSR)在图像加密中的应用。本算法先采用LFSR算法产生伪混沌比特密钥流,将该密钥流作为随机值映射算法和加密算法的初始参数。随机值映射算法取其中较高位的密钥流,生成置乱序列用于图像像素的位置置乱。另一组密钥流作为加密序列可对图像的像素值进行加密。实验结果表明该方法运算速度快,通过随机值映射算法产生的伪随机置乱和加密序列具有很强的可操作性、保密性,而且截取伪混沌比特密钥流的位数也可作为密钥存在。For digital information protection, image encryption is an effective technology. As the development of information technology, people also need more and more security on image encryption. This thesis discussed the application in image encryption by line feedback shift register. At first the system generated the initial pseudo-chaos bit key stream by LSFR. The key stream becomed the initial parameter of the random value mapped scrambling algorithm and chaos encryption algorithm. Mapping the image with the mapped stream which was generated by the random value mapped scrambling algorithm with the higher digital key stream, then encrypted the image with the encrypted stream which was generated by another key stream. The result shows this system runs lastly. The pseudo-random mapped stream and pseudo-encrypted stream that were generated by the random value scrambling algorithm both had a strong operational, confidentiality. Also the chosen pseudo-chaos bit key stream can become the keywords.

关 键 词：线性移位寄存器 比特密钥流 随机值映射算法 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]