线衣 公开密钥认证过程 1950 Alice's public key ring Joy Mike Bob Bob's private Bob's public key key Transmitted ciphertext Plaintext Plaintext input Encryption algorithm Decryption algorithm output (e.g.,RSA) (reverse of encryption algorithm) (b)Authentication Figure 9.1 Public-Key Cryptography 2022/10/9 现代密码学理论与实践-09 71342022/10/9 现代密码学理论与实践-09 7/34 公开密钥认证过程