Research On Color Digital Image Encryption Algorithm Based On Hyper Chaos Theory

With the rapid development of network information technology in recent years, the development of network multimedia technology is also accelerating. With the rapid development of technology, it shows that the spread of information is becoming more and more fast. Information in a wide variety of forms, there are text, voice, image, video and so on. But no matter what kind of form of information, in the process of communication, to ensure the integrity and accuracy of information. So the security of information becomes especially important.Image encryption technology is an important branch in the field of information security, which is used to protect the security of image information. Has been the emergence of images from the encryption methods, there are two problems worthy of further research: one for the gray image encryption method is more; another is attacked image means to increase day by day, the anti attack ability of image encryption process needs further enhance.According to this, this paper studies the encryption method of color image as the core content, and the following research work is carried out:First, the one-dimensional, two-dimensional and three-dimensional chaotic systems are compared and analyzed, and the corresponding chaotic mapping theory is analyzed. Based on 3D Feng mapping, a color image encryption method is constructed. This method first transforms the image from the RGB space to the HSV space, and then uses the Feng mapping to expand the multiple computation, thus constructed the complete encryption process and the decryption process.Second, in one-dimensional, two-dimensional and three-dimensional chaotic mapping theory based on the further study of ultra chaotic mapping. Accordingly, will be extended to 3D Feng mapping into four-dimensional hyper chaotic system, and then construct a hyper chaotic image encryption method. This method combines the four dimensions of the hyper chaotic map, the image data is processed by corresponding bit operations, which can realize the diffusion and scrambling of image information.Third, were tested and compared from the anti attack performance, safety performance, execution time of color image encryption algorithm. From the test and comparison results show that the two algorithms have good encryption effect and anti attack ability of color image.