A fast image encryption algorithm using plaintext-related confusion

A new plaintext-related image cryptosystem based on chaotic system is presented, which includes a pair of plaintext-unrelated forward diffusion and backward diffusion, and one plaintext-related confusion. In the confusion algorithm, the permuted location of current pixel is derived from the sum of the values of all the pixels that are in the same row or column as current pixel except current one. Simulation results show that the suggested system has good characters of high speed, large key space, strong secret key sensitivity, strong plaintext sensitivity, excellent cipher-text statistical properties, etc.