基于混沌理论的数字多媒体图像加密研究

Research on Digital Multimedia Image Encryption Based on Chaos Theory

加密是保证图像信息安全性和完整性的有效途径,以数字多媒体图像为操作对象,提出基于混沌理论的数字多媒体图像加密方法。首先采集数字多媒体图像样本,在初始图像中嵌入水印,然后利用混沌理论置乱数字多媒体图像像素位置,生成相应混沌密钥,经过数字多媒体图像的扩展,实现数字多媒体图像的加密处理。通过加密效果的测试得出结论:优化加密方法输出结果的灰度均衡度为0.97,像素改变率为2.7%,即优化设计的数字多媒体图像加密方法在灰度均衡度和抗攻击能力方面均具有良好优势。

Encryption is an effective way to ensure the security and integrity of image information.Taking digital multimedia images as the operating object,a digital multimedia image encryption method based on chaos theory is proposed.First,the digital multimedia image samples are collected,and the watermark is embedded in the initial image.Then,the chaotic theory is used to scramble the pixel positions of the digital multimedia image,and the corresponding chaotic key is generated.After the expansion of the digital multimedia image,the encryption of the digital multimedia image is realized.Through the test of encryption effect,it is concluded that the grayscale balance of the output result of the optimized encryption method is 0.97,and the pixel change rate is 2.7%,that is,the optimized digital multimedia image encryption method has good advantages in grayscale balance and anti attack capability.