Image Encryption Algorithm Based On Chaos Theory And Realization

In this information age,with the technology of the communication and internet,more and more messages are transmitted in the internet.The security of messages became more and more important that make the encryption theory and technology to be a primary domain of the information science and technology.Many governments have attached great importance to the reveal of messages,because it threatens the national defense and economy.Chaos widely exists in our natural world as a series of stochastic process in non-linear deterministic dynamical system.Because chaos is extremely sensitive to initial conditions of the chaotic system,and a large number of non-periodic,continuous broadband frequency spectrum,noise-like,yet deterministic and reproducible signals can be generated,it has natural concealment.What's more,chaotic signals can't be forecast for a long term,and it is extremely complicated,and easily realized,the application of chaos theory has been one of important issues and forefront project.This works mainly includes the design and realization of the chaotic cryptography,especially the cryptography algorithms of images that used chaotic sequences. Scientifically introduced the principle of modern cryptography. It pays emphasis on the application of chaotic sequences in cryptography .We proposed a novel image cryption agrithm based on improved logistic maps chaotic sequences sort to rewrite the pixel value of an image,and described the algorithm in detail.Because the security of most conventional chaos based encryption algorithms are low, to solve these problems,we we proposed a novel image cryption agrithm based on two-dimensions chaotic sequences sort. The algorithm can transform the address codes of the RGB images by the sort transformation of the arnold maps chaotic sequences. The experimental results show that the algorithm has nice serambling capability and guarantees the seeurity of the encrypted images effectively. It improved the complexity of the encryption system and made the system more difficult to break.