传输控制协议TCP属于传输层协议，而用户数据报协议UDP属于网络层协议。

传输控制协议（TCP）属于传输层协议，而用户数据报协议（UDP）属于网络层协议。（）

Symmetric, or private-key, encryption is based on a secret key that is shared by both communcating parties. The （ ） party uses the secret key as part of the mathematical operation to encrypt （ ） 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 （ ） 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 ia used for encyption and the other for decryption, depending on the nature of the communication service being implemented. In addition, public key encryption technoligies allow digital （ ） to be placed on messages. A digital signature uses the sender&39;s private key to encrypt some portion of the message. When the message is received, the receiver uses the sender&39;s （ ） key tp decipher the digital signature to verify the sender&39;s identity.

属于委托代征税款协议书内容的是：（）。

Given： A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap. Which two methods should be overridden to assure that Key works correctly as a key？（）

A programmer is developing a class Key， that will be used as a key in a standard java.util.HashMap.   Which two methods should be overridden to assure that Key works correctly as a key？（）

With PGP， which of the following entity signs a users’s public key？（）

下列属于《建设工程施工专业分包合同（示范文本）》的内容中《协议书》内容的是（）。

S/Key协议属于( )的内容。

试述S/KEY协议的认证过程。

房屋征收部门与被征收人订立补偿协议，以下哪些属于协议应当具备的内容（）。

以下哪些属于签订服务协议的主要内容（）。