Digital Image Scrambling Algorithm Based On Chaotic Map

Digital image information security is accompanied by a computer network and multimedia technology and the rapid development of the new problems. In recent years, the digital image technology gradually overcome the memory of the past because of the difficulties caused by the enormous and become information-expression of the mainstream, how to ensure that digital image information security has become internationally popular research topic. Digital image scrambling digital image encryption method is an important technology, and there are many mature Scrambling methods, such as matrix-based transform scrambling method, based on a curve transform scrambling algorithm, based on the pixel value of the home arbitrary method, based on the scrambling chaos mapping methods, and so on.Digital image is a clear visual images, scrambling encryption principle is that the original image will be clear after matrix transform scrambling curves were obtained after a chaotic images, and images from encrypted in the original image and without any related information. As chaotic sequence with the initial value of randomness and sensitivity, so chaotic sequence image scrambling, scrambling the image correlation of smaller, adjacent point is a greater gap between the value of pixels, which will be more effective Scrambling good. For this purpose, this paper presents two maps based on the chaotic image scrambling method is to first go through a Cat mapping transformation, the initial value of the pixels set to rearrange the position of scrambling to achieve, and then position Scrambling Lu use of the image mapping, once again scrambling its pixel values in order to have a double scrambling encryption image. One kind of scrambling method is to use a Logistic mapping settings initial two Scrambling sequence with the one scrambling sequence of the first images Scrambling position, and then to another location scrambling sequence of the images Second Scrambling to achieve double image encryption effect.In this paper it used Matlab to carry on the massive simulation testing, and carried on the analysis to the experimental result, has confirmed the method feasibility and validity.