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cryptography I know, apart from the text annotation, and special thanks are listed in the contents, the paper does not contain the other people have written or published by the results of research; Nor was contained to the Xi'an University of Electronic Science and Technology or other educational institutions or degree certificates used materials. I work together with the comrades of the Institute of any contribution made in the papers have made clear the note and expressed gratitude. To apply for graduate theses with the information if false, I bear all the responsibilities associated with.