1. School of Cyber Science and Engineering, Wuhan University, Wuhan, China
2. Department of Information Security, Naval University of Engineering, Wuhan, China
3. Key Laboratory of Cryptography of Zhejiang Province, Hangzhou Normal University, Hangzhou, China
4. Department of Information Systems and Cyber Security, and the Department of Electrical and Computer, University of Texas at San Antonio, San Antonio, TX, USA