A certificate store is an archive file that contains almost any number of digital certificates, possibly certificates that are issued from different certificate authorities.
Trusted certificate authorities issue digital certificates, which are then used to authenticate users and organizations for access to Web sites, E-mail servers, and other secure systems.
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PAC 版本应该由颁发证书的权威机构进行维护;当用户组的成员关系发生变化时,版本也应该变化。
PAC versions should be maintained by the certificate-issuing authority; the version should change when the user's group membership information changes.