结合EZW和AES的图像加密机制

随着图像或视频的网络应用日益普及,各种各样的新型应用不断涌现.由于图像或视频在网络中传输时,网络本身的安全措施并不能完全阻止非法截取事件的发生,因此人们对于图像数据传输的有效性和安全性提出新的要求.提出一种新的方法,其基本思想是通过结合使用离散小波变换(DWT)、嵌入式零树小波编码(EZW)和高级加密标准(AES),在对需要传输的图像充分压缩的基础上,对编码码流加密置乱,从而同时达到有效和安全传输的目的.实验结果表明,该方法在保持较高压缩效率的同时,增强了码流在传输过程中的安全性.

Image Encryption Combining EZW and AES

With wide spread of image and video in internet, various kinds of novel implementations have appeared in recent years. In some of these implementations, private-information-contain images are employed usually. Due to vulnerability to illegal accessing during transmission of image and video, requirement of security is impending. A new algorithm is addressed and the essence of this method is that by combination of Discrete Wavelet Transform (DWT), Embedded Zerotree Wavelet Algorithm (EZW), and Advanced Encryption Standard (AES), encrypt compressed stream to ensure the transmission efficiency and security. The experiments demonstrate that our new algorithm can improve the security of media stream besides keeping high compression rate.