New Algorithm for Color Image Encryption Using Chaotic Map and Spatial Bit-level Permutation

With the fast progression of data exchange in electronic way, information security is becoming more important in data storage and transmission. This paper proposed a new algorithm for color image encryption using chaotic map and spatial bit-level permutation (SBLP).Firstly, use Logistic chaotic sequence to shuffle the positions of image pixels, then transform it into a binary matrix including the red, green and blue components simultaneously, and permute the matrix at bit-level by the scrambling mapping generated by SBLP. Secondly, use another Logistic chaotic sequence rearrangement of the position of the current image pixels. Experiment results and security analysis show that the algorithm can achieve good encryption result and low time complexity, in addition, the key space is large enough to resist against common attack.