混沌与加权酉变换图像加密算法研究

With the rapid development of the network and the information technology, the information security and confidentiality of digital image has drawn more and more attention. So image encryption technology has become a hot research. Chaos has become a important encryption method for its good properties such as being sensitive to the initial condition and randomness. Encryption based on chaos which does transform in the image space domain has a drawback. If the encrypted image loses some information, the decrypted image is equivalent to lose the same information. So the robustness of encryption method based on chaos isn't very good. As a new tool of encryption, weighted unitary transformation has been paid a great deal of attention. This weighted unitary transformation does image encryption in the transform domain. When the encryption image lost some information during the transmission, the decryption image still contain most of the original image information. So the robustness of encryption method based on this weighted unitary transformation is very good. Thus, research on encryption algorithm combining weighted unitary transformation and chaos has great significance.