| Recently,the issue of digital image security has become the focal point question which the entire society pays attention to together.However,the most effective technology to solve the image information security is image encryption,therefore,the research on the image encryption became a very important issue.Compared to the chaos,hyper chaos has more complex dynamical behaviors,more efficient control parameters and more sensitive to the initial value.According to these features,The application of hyper chaos in digital image encryption can make image encryption effect,key space,security and anti—attack capabilities better.A new method based on the theory of Radon transform encryption and hyper chaos to encrypt the image predict is proposed in this paper,add hyper chaos system In the process of image Radon scrambling can gain the complex time series with more pseudo-random and non-periodic.If these time series are pretreated and applied to the encryption algorithm in this paper,the key space can be increased sufficiently so that the encrypted key will become very safe.As a comparison,this paper analyzes an image encryption algorithm,which just use Radon transform,but,whether in vision effect or performance analysis,the encryption effect of this algorithm is not as good as algorithm after increase hyper chaos.That is to say,after the algorithm increase hyper chaos,the overall performance of the system is increased.In this paper,the simulation and analysis of the algorithm are carried out.The results of property of resisting differential analysis showed the value of NPCR and UACI of this algorithm is closer to the ideal value.Through the analysis of pixel correlation,anti-attack,gray histogram and key sensitivity of plain-text image and cipher-text image,the encryption effect of this algorithm is proved to be ideal. |
