The Application of CA Digital Certificate and Organizational Code Certificate;
最困难的问题是建立数字证书目录。
A digital certificate is issued by a trusted authority (a certificate authority or ca) and is issued only for a limited time.
数字证书由受信任机构(认证机构或CA)发布，并且限制了使用期限。
Browsers and other security applications using digital certificates can verify that the certificate has not been revoked by either the owner or the ca.
浏览器和其他使用数字证书的程序都可以验证这个证书已经被其属主或CA撤销了。
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