Message authentication provides a way to ensure message integrity and to verify who sent the message 消息验证提供一种确保消息完整性和验证消息发送者的方法。
You should not trust the validity of this message until you verify its contents with the sender 除非您和它的发送者确认了其内容，您不应该相信此消息的有效性。
Guarantees that the sender of the message cannot deny that he she sent it at a later point in time 不可抵赖保证消息的发送者不能否认他/她稍后会及时发送消息。
Other rules need to be updated as the products and scams advanced by spammers evolve 因为垃圾邮件发送者所开发出的产品和诡计在不断变化，所以需要更新其它一些规则。
Udp is a message - oriented protocol that preserves the boundaries of messages between the sender and receiver Udp是面向消息的协议，它保留发送者和接收者之间的消息边界。
The sender can not decide whether or not the receiver can open the and which message he can open 发送者不能确定接收者是否能够打开消息也不能确定接受者打开的是哪个消息。
Message integrity verification and authentication are important aspects of information security technology 消息的完整性与消息发送者的身份验证是信息安全的重要组成部分。
Send this to everyone you consider a friend , even if it means sending it back to the person who sent it to you 发给每一个你当作朋友的人，甚至也包括回发给这封信的发送者。
Nonrepudiability - the sender of the data cannot deny that they sent it , and they cannot deny the contents of the data 无争议发送者不可否认该文档确由其发送，也不能否认文档的内容。
Extensibility allows the sending service to add additional information to the message beyond what is specified in the schema 扩展性使服务发送者能够给发送的消息增加格式没有定义的信息。
