An Improved Image Encryption Algorithm Based on a New Two-Dimensional Map
The paper analyzes a symmetric image encryption scheme based on a new chaotic two-dimensional map. The map can encrypt image. The numbers of the left-map and the right-map are used as the secret keys of encryption. A diffusion mechanism was used to diffuse the pixels of image. But it isn’t enough safe. Firstly there are a lot of week keys and duplicate keys. Secondly the diffusion mechanism is too simple to ensure the information security. The paper designs a new method of keys generation. The keys are non-zero and random. It has a large keys space and avoids the duplicate keys. Then it takes parts of keys as the parameters of a classic chaotic map. The process is the new diffusion mechanism. It solves the problem of weak keys. Simulation results show the effectiveness of the method.
Yuhang Yang, Xilong Qu, Yiping Luo and Aimin Yang
F. Huang et al., "An Improved Image Encryption Algorithm Based on a New Two-Dimensional Map", Advanced Materials Research, Vol. 216, pp. 293-296, 2011