The Research of Fast Image Encryption Algorithm Based on Bilateral Direction Diffusion Mechanism Integration with Synchronized Pseudo-random Number Generator
XU Shuan · Science Technology and Engineering · 2014
To defects such as the low speed of encryption and decryption,as well as the low computation efficiency induced by the single diffusion mechanism in the current chaotic-based encryption system,and can not satisfy the security and real-time transmission when in the face of high resolution,large capacity image,so a bilateral direction diffusion mechanism and synchronized pseudo-random number generator were designed to propose the fast image encryption algorithm based on bilateral direction diffusion mechanism integration with synchronized pseudorandom number generator to solve above problems,and the comparative analysis was done with the traditional diffusion mechanism. The initial conditions were produced by the external key of 256 bites under the synchronized pseudo-random number generator to iterate the hyper-chaotic system for getting one group hyper-chaotic sequence; then the permutation method of position set was used to permute the pseudo-random sequence to get one position set,and used it to permute the image; Finally,the key stream mechanism was used to treat the hyper-chaotic pseudo-random sequence,and use the double-direction diffusion mechanism to encrypt image. The MATLAB simulation software was used to validate the method proposed,the results showed that the image encryption algorithm had better encryption performance,the key space is larger,the anti-plaintext attack property was greatly enhanced; comparing with the traditional diffusion mechanism,the encryption algorithm had a high computational efficiency and high encryption speed to meet the requirement of real-time transmission.