图像水印技术在图像加密中的应用研究

Application Research of Image Watermarking Technology in Image Encryption

针对提高图像加密安全性的问题。本文将混沌加密与数字水印技术相结合,提出基于混沌加密与数字水印相结合的图像二次加密系统。将图像水印嵌入到混沌加密的图像,得到含有水印的二次加密图像,在不提取水印的情况下,原图像是不可能解密的。而且,含有水印的加密图像和混沌加密的图像在视觉上都属于加密图像,使得系统具有较强的伪装性;对加密过的密文图像具有身份认证功能;可利用还原的水印信息判断加密图像在传输中是否被篡改等信息。实验验证了该系统的有效性。为图像加密传输提供一种较好的技术方案。

To solve the problem of increasing security of image encryption this paper presents an image two-time encryption system based on the combination of chaotic encryption and digital watermarking. The image watermark is embedded into the chaotic encrypted image to get the two-time encrypted image, and it is impossible to decrypt the original image without extracting the watermark. In addition, the watermark image and the chaotic image are all encrypted images, which makes the system have strong camouflage. The encrypted image has its unique identity because the watermark can be used to judge whether the encrypted image is tampered within transmission.Experimental results verify the effectiveness of the proposed scheme. It provides a good technical method for image encryption transmission.