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数字证书就是网络通讯中标志通讯各方身份信息的一系列数据，其作用类似于现实生活中的身份证。它是由一个权威机构发行的，人们可以在交往中用它来识别对方的身份。数字证书的格式一般采用X.509国际标准。一个标准的X.509数字证书包含以下一些内容：①证书的版本信息；②证书?
The digital certificate is a series of data of identity information of the symbolic communication parties in the network communication, and its role is similar to that in real life. It is issued by an authority that people can use to identify each other’s identities in communications. The format of digital certificate generally adopts X.509 international standard. A standard X.509 digital certificate contains the following contents: ① certificate version information; ② certificate?