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A Steganographic Method Using MRF-Synthesized Textures as Cover Images

為了解決Fit Modulo X的問題，作者張鳳如 這樣論述：

With the highly developed technology, the Internet is closely combined with human life. The issue of how to protect personal privacy even commercial confidentiality is attention-getting. Steganography embed secret messages into multimedia as images, audios, videos and etc. to avoid hackers abstract

or alter the important data from one’s sending documents. We adopt a grayscale statistical texture synthesizer based on MRF to generate an image of user-requested size to fit the secret message. Each of our synthesized texture images as cover images contains four gray values: 30, 100, 170, and 240.

We encrypt secret messages via exponent and modulo operations. Then we partition the encrypted bit sequence of the secret message as many of 2-bit words: 00, 01, 10 and 11, thus each 2-bit word naturally corresponds to one of the four gray values 30, 100, 170 and 240. To be more secure, we adopt a

circular shift technique on (30, 100, 170, 240) such that the same 2-bit words need not be embedded into the same pixel values and the security could be further ensured. Experiments are given to demonstrate our approach.