1. Beijing Key Laboratory of Electronic System Reliability Technology, Capital Normal University, Beijing 100048, China
2. State Key Laboratory of Computer Architecture, Institute of Computing Technology, Chinese Academy of Sciences, 100190, China
3. Guangxi Key Laboratory of Trusted Software, Guilin University of Electronic Technology, 541004, China
4. College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
5. Electrical and Computer Engineering, Portland State University, Portland, OR 97201, USA