An efficient space filling curve based image encryption

There has been an increasing concern for the fast image encryption of multimedia data in the Internet world. The different varieties of encryption methods are introduced to ensure the fast execution, but most of the methods did not improve the speed. In this research work, a simple and the fast image encryption scheme based on Space Filling Curve (SFC) is proposed. The SFC is a method to traverse every pixel of the image continuously and based on that the proposed research work designed a new square-wave confusion and saw-tooth diffusion method for the fast image encryption. Initially, the original image is scrambled by square-wave confusion with different orders and subsequently diffused by saw-tooth diffusion method with different orders. This combination of confusion and diffusion is repeated in many times to obtain the final encrypted image. The experiment results and performance analysis demonstrate that our proposed scheme is a fast and efficient scheme.