Abstract: In order to protect the information of images effectively,a novel image encryption scheme based on Logistic map and hyper-chaos system is proposed in this paper.The encryption system employs the chaotic sequence of Logistic map combining hyper-chaos to scramble the pixel matrix and make gray-level transformation.Simulation experiment and security analysis show that the suggested algorithm is of high security,a large key space,and relatively high sensitivity to secret keys.At the same time,it achieves the aim of 'one time one key' and can defend exhaustive attack,statistical attack and chosen-plaintext attack.