数字证书最通常的一个应用是验证一个正在发送信息的用户是否是他或她所宣称的那个人，并提供给接收者对应答进行编码的方法。

• The most common use of a digital certificate is to verify that a user sending a message is who he or she claims to be, and to provide the receiver with the means to encode a reply.