Several Typical Implicit Write System Safety Studies

In this thesis, give some details on the aspects of the steganography, such as the principle, application. development and so on. Then we summarize the existing stego-systems and the steganalytic techniques in the still images, and point out their advantages and disadvantages. We test some typical stego-systems, including RS Steganalysis steganography using stochastic modulation and steganography using image whitening, on the platform of Visual C++, and also present some improve suggestions. It is tested that the RS Steganalysis can successfully attack the LSB systems, and even calculates the capacity of the stego-image. We use the concept of relative entropy to judge the security of some stego-systems, and the experiments indicate the high security of these systems. We will improve on the traditional LSB technique to increase the capacity. In the last part of this thesis, we will analyze the direction of the development of steganography and steganalysis.