⑧饼 CHAPTER NTRODUCTION The art of war teaches us to rely not on the likelihood of the enemy's not coming,but on our own readiness to receive him;not on the chance of his not attacking,but rather on the fact that we have made our position unassailable. -The Art of War,Sun Tzu 甲 2022/10/9 Cryptography and Network Security-1 9/432022/10/9 Cryptography and Network Security - 1 9/43 Chapter 1 – Introduction ⚫ The art of war teaches us to rely not on the likelihood of the enemy's not coming, but on our own readiness to receive him; not on the chance of his not attacking, but rather on the fact that we have made our position unassailable. —The Art of War, Sun Tzu