System and methods for real-time encryption of digital images based on 2D and 3D multi-parametric chaotic maps

摘要

Two classes of new chaotic maps are introduced in this invention for real-time encryption of digital images: A first method that utilizes a parametric family of 2x2 generalized chaotic cat maps for shuffling the spatial positions together with Chen's chaotic map for key generation. This is a line-based system that enables real-time encryption, in that image encryption is performed line by line while the image is being scanned. Off-line or parallel processing in pixel shuffling and key generation facilitates real-time applications. In this first method, gray values of the image pixels are treated by a diffusion technique. A second method utilizes an extended parametric family of 3x3 generalized chaotic cat maps for both pixel-positions and gray-values shuffling. For the two proposed new methods, reversible (i.e., lossless) compression algorithms are integrated as an option of the cryptosystem.