□ Kerckhoffs's principle summary : cryptosystem's stability must rely on the safetiness of key
□ The meaning of the principle
○ It does not mean to be open all the information other than the key
○ It should be safe even if cryptographic algorithms is opened
○ The fewer secret data has, the easier keeping safety
○ Since the "key" only secret data, the secret data is limited to protect
○ It should be safe even if cryptographic algorithms is opened
○ The fewer secret data has, the easier keeping safety
○ Since the "key" only secret data, the secret data is limited to protect