A symmetric image encryption approach based on line maps

This paper proposes a new line map, which is an invertible chaotic two-dimensional map. The algorithm of the line map is formulated. An image encryption scheme based on the line map is developed that maps a image to a row of pixels and further fit to a same size image using the line map. The line map is generalized by using some parameters, the numbers of the left and the right line map, which are used as the key. For encryption, several iterative applications are made to a digital image. While for the deciphering process, the inverse of the line map is applied with the same number of iterations. The image encryption and deciphering scheme based on the line map has no information loss. The experimental tests are carried out and the results show the effectiveness of the new scheme.