Affiliation: | 1. School of Information Engineering, Xuchang University, Xuchang, 461000, China 2. Information Security Center, Beijing University of Posts and Telecommunications, Beijing, ?100876, China 3. College of Science, China Three Gorges University YiChang, Hubei?, 443002, China 4. Graduate University of Chinese Academy of Sciences, Beijing, 100190, China 5. School of Information Engineering, Beijing Institute of Graphic Communication, Beijing, 102600, China
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