I was very excited when the paper was finished. I got a lot of enthusiastic help from the topic selection, data collection, writing and arrangement of the paper.

First of all, I would like to thank Mr. Zhang Yuqing, who led me into the door of information security and put forward many valuable opinions on my research, which made my research work have goals and directions. He has given me careful guidance and education in the past two years. So that I can continue to study and improve, and the research results of these topics have become the main material of this paper.

At the same time, I admire Mr. Zhang's profound knowledge and rigorous academic attitude, which is an example for me to study and work in the future. Thank you again for your concern and care, and I would like to express my most sincere thanks.

Self-taught thesis thanks to Fan:

College life passed quickly, and when I look back on the past years, my heart feels full. When I finished writing this graduation thesis, I felt a sense of relief and a lot of feelings.

First of all, I sincerely thank my thesis supervisor _ _ teacher. She took time out of her busy teaching work to review and revise my paper. And all the teachers who have taught me, your rigorous and meticulous style has always been an example in my work and study; Their persuasive teaching and eclectic thinking have given me endless inspiration.

Thank my classmates and friends who have been with me for three years, and thank them for their useful suggestions and opinions. With their support, encouragement and help, I can fully spend three years of study life.

This thesis was completed under the careful guidance of Professor Zhan Huaiyu and Researcher Fu. My tutor's profound professional knowledge, rigorous academic attitude, work style of striving for perfection, tireless noble morality, noble demeanor of being strict with oneself and lenient with others, unpretentious and approachable personality charm have a far-reaching influence on me. Not only has he set up lofty academic goals, mastered basic research methods, but also learned a lot about treating people with things and dealing with others. From the topic selection to the completion of this paper, every step was completed under the guidance of the tutor, who devoted a lot of effort. Here, I would like to express my high respect and heartfelt thanks to my tutor! The successful completion of this paper can not be separated from the care and help of teachers, classmates and friends. Thanks to senior engineer Yue Baozhen, Professor Zhang Zeng, Teacher Li Bingyun and Teacher He Wanfen for their guidance and help. Thank teachers for their guidance and help, such as ... in key laboratories; Thanks to Professor Xie Yongqun, Professor Chen and Senior Engineer Huang of Fujian Agriculture and Forestry University for their concern, support and help. I would like to express my deep gratitude here. Without their help and support, I can't finish my doctoral thesis, and the friendship between my classmates will last forever.

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