The Improvement Of Image Encryption Scheme On Classic Logistic Mapping And The Research On Digital Image Encryption Technology Based On Double Chaos

The 21 st century is the era of information explosion, every big enterprise's database,electronic banking equipment, network knowledge database of schools, monitoring equipment in shopping network and so on,all sorts of information technology constantly affect people's life, but it also brought the leakage of many privacy information for the individual and brought huge economic losses for the society, so it is of great significance for the secure information transfer and confidential work.With the popularization of the image vector, the problem of cryptography in digital images becomes a hot spot. Because chaotic system has high sensitivity to initial values, strong randomness, and unpredictable characteristics, it has been widely used in communication and securityBased on the study of the chaotic characteristic of cellular neural network,we combined with one dimension logistic mapping and three-dimensional chaotic systems of cellular neural network,adopt double chaos system to improve the classic logistic mapping image encryption,can solve the problem of single digital image encryption chaotic systems, such as weak ability to resist attacks, security is low, easy to be cracked by password analyst. So we can achieve the purpose of the digital information security pass. The new scheme through image security inspection, compared to the original algorithm it has certain feasibility. In order to further improve the security and encryption design complexity, we use of high-dimensional hyperchaos system for digital image encryption design, combined with a wireless folding map constructed a new double chaos digital image encryption algorithm, and the concrete have been carried out to verify the security of the system.Paper structure is divided into five parts altogether,firstly,the introduction, mainly introduces the paper research background and significance, research status both at home and abroad as well as the main research content of this paper.than, digital image encryption theory,first introduces the basic theory of cryptography, and then introduces relevant knowledge of digital image and image encryption based on chaos theory.Combined with the chaos of cellular neural network systems, we improve the classic Logistic mapping image encryption,and verify its feasibility and security of the algorithm.Because higher dimensional hyperchaos system is more complicated than low dimensional chaotic system in chaos phase space, we expand simple chaotic systems to six d hyperchaos system, and it through the experimental simulation, the encryption effect is good.Finally we put forward the shortage of the paper andimprovements, and make statements about the future research direction.