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Security Identifier
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Security Identifier : ウィキペディア英語版
Security Identifier
In the context of the Microsoft Windows NT line of operating systems, a Security Identifier (commonly abbreviated SID) is a unique, immutable identifier of a user, user group, or other security principal. A security principal has a single SID for life, and all properties of the principal, including its name, are associated with the SID. This design allows a principal to be renamed (for example, from "John" to "Jane") without affecting the security attributes of objects that refer to the principal.
==Overview==
Windows grants or denies access and privileges to resources based on access control lists (ACLs), which use SIDs to uniquely identify users and their group memberships. When a user logs into a computer, an access token is generated that contains user and group SIDs and user privilege level. When a user requests access to a resource, the access token is checked against the ACL to permit or deny particular action on a particular object.
SIDs are useful for troubleshooting issues with security audits, Windows server and domain migrations.
The format of an SID can be illustrated using the following example: "S-1-5-21-3623811015-3361044348-30300820-1013";
Possible identifier authority values are:
*0 - Null Authority
*1 - World Authority
*2 - Local Authority
*3 - Creator Authority
*4 - Non-unique Authority
*5 - NT Authority
*9 - Resource Manager Authority〔See "Custom Principals" section on https://msdn.microsoft.com/en-us/library/aa480244.aspx〕〔http://blogs.msdn.com/larryosterman/archive/2004/09/01/224051.aspx〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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