2. 计算机
  3. Symmetric，or private-key，encryption is based on a secret key that is shared by both communicating parties．The___________(71)part

Symmetric，or private-key，encryption is based on a secret key that is shared by both communicating parties．The___________(71)part

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问题 Symmetric，or private-key，encryption is based on a secret key that is shared by both communicating parties．The___________(71)party uses the secret key as part of the mathematical operation to encrypt _____________(72)text to cipher text．The receiving party uses the same secret key to decrypt the cipher text to plain text．Asymmetric，or public•key，encryption uses two different keys for each user：one is a ____________(73)key known only to this one user；the other is a corresponding public key，which is accessible to anyone．The private and public keys are mathematically related by the encryption algorithm．One key is used for encryption and the other for decryption，depending on the nature of the communication service being implemented．In addition，public key encryption technologies allow digital____________(74)to be placed on messages．A digital signature uses the sender’S private key to encrypt some portion of the message．When the message is received，the receiver uses the sender’s____________(75)key to decipher the digital signature to verify the sender’S identity．
(75)
选项 A、plain
B、cipher
C、public
D、private
答案C
解析 对称加密或私钥加密的基础是通信双方共享同一密钥。发送方使用一个密钥作为数学运算的一部分把明文加密成密文。接收方使用同一密钥把密文解密变成明文。在非对称或公钥加密方法中，每个用户使用两种不同的密钥：一个是只有这个用户知道的私钥；另一个是与其对应的任何人都知道的公钥。根据加密算法，私钥和公钥是数学上相关的。一个密钥用于加密，而另一个用于解密，依赖于实现的通信服务的特点而用法有所不同。此外，公钥加密技术也可以用于报文的数字签名。数字签名时使用发送方的私钥来加密一部分报文。当接收方收到报文时，就用发送方的公钥来解密数字签名，以便对发送方的标识进行验证。
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