FAN transform in image scrambling encryption application

In the digital watermarking technology, often using Arnold transform scrambling watermark images, but Arnold transform is given only one form and it is an open form, so reducing their security. In this paper, a species that contains a lot of FAN transform set, and Arnold transform is only one of a special case. Since the type of transformation is infinite, it will increase the difficulty of cracking and improve security. In this paper, the FAN transform principle is presented, and verified the practical effect in computer.