Introduction: 1. Course introduction 2. At the beginning of the password, learn about several historical encryption methods, learn about XOR operations, and understand DES and AES encryption algorithms 3. DES encryption practice Learn to use DES encryption 4. AES encryption practice Learn and practice AES encryption 5. Learn the principles of RSA encryption and understand the asymmetric encryption algorithm 6. Learn to use RSA encryption in practice 7. Man in the middle attack Understand when a man in the middle attack 8. Learn to use the MD5 function by Hash function 9. Comprehensive practice combines knowledge learned to do a comprehensive practice 10. Summarize, review, summarize what you learned in the course