Image encryption method based on cross spiral transformation

The invention discloses an image encryption method based on cross spiral transformation, and belongs to the field of information encryption. Information is easily tampered and leaked in the transmission process, and in order to guarantee the security of images in the transmission process, the invention provides an image encryption method based on cross spiral transformation. The method adopts a scrambling-diffusion framework. The scrambling stage is improved on the basis of traditional spiral transformation, scrambling can be conducted from any pixel point on the two-dimensional level, different channels interact with one another on the three-dimensional level, and correlation of the channels is weakened. In the diffusion stage, row-by-row or column-by-column bit-level pixel diffusion is selectively carried out in a mode of dividing different intervals. Experimental results and method analysis show that the method has good statistical characteristics and robustness, and can effectively guarantee the security