1. College of Computer Science and TechnologyNanjing University of Aeronautics and Astronautics Nanjing 210016 China
2. Collaborative Innovation Center of Novel Software Technology and IndustrializationNanjing University Nanjing 210023 China
3. MIIT Key Laboratory of Safety‐Critical SoftwareNanjing University of Aeronautics and Astronautics Nanjing 210016 China
4. Guangxi Key Laboratory of Cryptography and Information SecurityGuilin University of Electronic Technology Guilin 541004 China
5. College of Computer and Control EngineeringNankai University Tianjin 300350 China
6. School of Computer and Educational SoftwareGuangzhou University Guangzhou 510006 China