基于位运算的图象加密技术的研究

Analysis Based on Picture Encryption Technology of Position Operation

近些年来,随着信息化和宽带网络在我们日常生活中的迅速发展,图像数据开始在因特网上日益流行。由于某些图像数据具有非常特殊的安全保密性,即发送方与接收方都不希望在网络上传输的图像数据被未经授权者所浏览或处理,因此图像数据的安全性显得极为重要。目前,基于位运算的图像加密技术的加密算法主要有流密码加密和分组密码加密两种。本文将对这两种密码体制进行分析与比较,并将其应用于加密BMP格式的彩色图像,最后的出结论只有正确选择密码的多样性和长度,才能取得良好的图像加密效果。

Recently, along with the information and the wide band network in our daily life rapid development, the image data starts on Intemet tobe day by day popular. Because certain image datas have the extremely special security secrecy, namely the transmission side and the receiving end：all did not hope transmits the image data in the network without authorization to glance over or processing, therefore the image data security appears extremely importantly. At present, mainly has the stream cipher encryption and the block cipher based on the position operation picture encryption technology encryption algorithm encrypts two kinds. This article will carry on to these two kind of passwords system analyzes and compares, and will apply it to encrypts the BMP form colored picture, the final conclusion will only have the correct choice password the multiplicity and the length, will be able to obtain the good picture encryption effect.