A New Color Image Encryption, Arithmetic Based On a Three-Dimensional Map

The paper proposes a new color image encryption arithmetic. Firstly, the paper introduces separation of R,G,B components of a color image. Then a new two-dimensional map is presented. 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 plane image. Secondly, the map is further extended to the threedimensional one. A diffusion method is implemented fetching an initial seed from key generated, whose resulting value is used as seed for next value generation and the process is repeated. The key generated is shared between permutation and diffusion. The algorithm of the map is formulated, and the security of the proposed image encryption arithmetic is analyzed. The simulation results show that the proposed encryption arithmetic is valid.