A new image encryption arithmetic based on a three-dimensional map

The paper proposes a new image encryption arithmetic. Firstly, the paper introduces a new two-dimensional map. A square image is divided into two isosceles triangles according diagonal. Each pixel in a column is inserted to the adjacent column which utilizes the difference of the number of pixel of two adjacent columns. Then the plain image can be stretched to a line of pixels. The line is fold over to a new square image which size is same as the plain image. Secondly, the map is further extended to the three-dimensional one. The algorithm of the map is formulated, a method for key generation is designed and the security of the proposed image encryption arithmetic is analyzed. The simulation results show that the proposed encryption arithmetic is valid.