基于图像信息摘要和RSA的图像加密技术研究

针对当今的信息安全问题和数字图像的特点，提出了一种基于图像信息摘要和RSA公钥密码体制的图像加密技术，利用图像信息摘要（IMD）构造图像像素置乱矩阵并对图像像素矩阵进行置乱后再运用RSA公钥加密算法对置乱后的图像加密。实验与讨论结果表明，该方案产生的IMD对图像变化极具敏感性，而且图像像素矩阵的置乱敏感地依赖于IMD，具有较好的加密效果，并对差分、少数据、统计分析攻击具有较好的抗击能力。

Investigation of image encryption techniques based on image message digest and RSA

Aimed at the question of information security and the characters of digital image nowdays,this paper presents an image encryption technique based on image message digest and RSA public key cryptosystem.By using the Image Message Digest(IMD) it constructs an image pixel confusion matrix,and confuses the image pixel matrix,then encrypts the confused image using RSA public key encryption arithmetic.Experimental and discussed results show that the procreant IMD is sensitive to the image transformation,and the confusion of the image pixel matrix depends on IMD sensitively,it has the better encryption effect and the better oppugnation ability to the attack of difference,fewer data and statistic analysis.