Abstract: In order to weaken the periodicity of the encrypted cipher for improving the security and dynamics of the algorithm, an image encryption algorithm based on cross - control mechanism and multi - direction folding and diffusion is proposed. Firstly, the initial image is divided into two equal blocks, and two random sequences were obtained by introducing the Logistic map to form the new group using the quantization mechanism so that two matrices were getting. Then the pixel cross control strategy was established according to the two matrixes to complete confusion of sub-blocks to reduce scrambling periodicity. Subsequently, the 4 direction folding encryption method is designed which each diffusion direction corresponds to a diffusion function to diffuse the pixels form 4 directions for weakening diffusion periodicity. he experimental results show that this algorithm has higher security and sensitivity compared with the current chaotic encryption techniques.

Key words: Quantization mechanism