The Research Of Digital Image Tamper Authentication Technique Based On Discrete Wavelet Transform

In recent years, with the development of digital watermarking and network communications technology, the digital media (digital image, digital audio, digital video and so on) has become an important source of obtaining information and a necessary part of people's life. However, the network information has the characters of transparence and easy manipulation, which make the vicious attackers tamper or forge the information easily. How to protect the integrity and authenticity of all kinds of digital media has become a problem which needs to be resolved urgently. The authentication technique based on digital watermarking is an effective method for protecting the authenticity of the multimedia information. It has become an investigative hotspot in the field of the security in multimedia information.This paper makes a deep introduce and research of the basic knowledge about digital watermarking technique firstly, including the fundamental principle, basic characteristics, algorithms and usual attack modes. And it depicts simply the basic knowledge of the wavelet theory as well as the application of wavelet transform within the image...