SIDs, GUIDs, and CLSIDs
In the Windows operating system environment, all users, groups, and computers have unique SIDs. A SID identifies a security subject or group of subjects. Local users and groups are assigned SIDs that are unique to a single computer, while domain objects are assigned SIDs that are unique within the domain. A subject’s SID is assigned when the subject is created and never changes throughout its lifetime. A user’s name can be changed, but the user’s SID remains the same. The use of SIDs gives Windows the ability to record references to users, groups, and computers that remain constant and don’t change over time.
As information systems have grown, they have become more diverse and distributed. Many applications now operate ...
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