Abstract
In this paper, a new bi-step quantum image cryptography algorithm is presented. The proposed scheme is consisted of four different coding algorithms. According to the pixels of original image and corresponding quantum bits of the generated random binary key, the employed coding algorithm is selected. The security of the proposed scheme is increased through randomization of binary image key generation and alteration the pixel values of the original gray-scale values. The simulation of the proposed scheme assures that the final coded image is completely meaningless and it could not be recognized visually through the analysis of the resulted meaningless coded image.