本文为土耳其中东技术大学（作者：SADIK BAHAETTĐN AKDAĞ）的硕士论文，共123页。

本文提出了一种新的JPEG静态图像加密方法，该方法在DCT信道中采用整数到整数变换和频域扰乱。与文献中现有的方法不同，加密图像可以在加密后进一步压缩，即转码。该方法通过调整参数提供选择性加密/安全级别。用不同的图像对该加密方法进行了测试，并从扰乱性能、带宽扩展、密钥大小和安全性等方面与文献中的方法进行了比较。最后将该方法应用于H.263视频序列的I帧加密。

In this study, a new method is proposed to protect JPEG still images through encryption by employing integer-to-integer transforms and frequency domain scrambling in DCT channels. Different from existing methods in the literature, the encrypted image can be further compressed, i.e. transcoded, after the encryption. The method provides selective encryption/security level with the adjustment of its parameters. The encryption method is tested with various images and compared with the methods in the literature in terms of scrambling performance, bandwidth expansion, key size and security. Furthermore this method is applied to the H.263 video sequences for the encryption of I-frames.

1.       引言

2. 多媒体标准与加密的研究背景

3. 本文提出的加密方法

4. 针对H.263提出方法的使用

5. 实验

6. 结论与展望

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