公钥基础设施（Public Key Infrastructure，PKI）引入数字证书的概
念，用来表示用户的身份。下图简要地描述了终端实体（用户）从认证权威机构
CA 申请、撤销和更新数字证书的流程。请为中间框空白处选择合适的选项（）。

单选题

The key issue in keeping in-groups productive is:

答案解析

单选题

Certificates are（ ）documents attesting to the（请作答此空）of a public key to an individual or other entity.They allow verification of the claim that a given public key does in fact belong to a given individual.Certificates help prevent someone from using a phony key to（ ）someone else.In their simplest form,Certificates contain a public key and a name.As commonly used,a Certificate also contains an（ ）date,the name of the CA that issued the Certificate,a serial number,and perhaps other information.Most

答案解析

单选题

公钥基础设施（Public Key Infrastructure，PKI）引入数字证书的概念，用来表示用户的身份。下图简要地描述了终端实体（用户）从认证权威机构CA 申请、撤销和更新数字证书的流程。请为中间框空白处选择合适的选项（）。

答案解析

单选题

Tom is afraid to speak in ___ public.

答案解析

单选题

Under this heading, list any notes or key points necessary in isolating the trouble in the sections and components.

答案解析