In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the an

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问题 In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. There are two types of key technology: private key and public key. Private - key encryption methods are called(66)ciphers, information is encrypted with(67)both the sender and receiver hold privately. Public - key encryption methods are called(68)ciphers,(69)created for each user, encryption key and decryption key ale(70).

选项 A、same
B、different
C、difference
D、some

答案B

解析 有两类密钥技术:私人密钥和公共密钥。私人密钥加密方法叫作对称式密码,信息被收发双方私下支持的密钥加密。公共密钥加密方法叫作非对称式密码,每个用户创造两个有关系的密钥,加密密钥和解密密钥不相同。
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