Definition

security identifier (SID)

In Windows NT and 2000 operating systems, the security identifier (SID) is a unique alphanumeric character string that identifies each operating system and each user in a network of NT/2000 systems.

Contributor(s): Anthony J. Galella
This was last updated in September 2005
Posted by: Margaret Rouse

Email Alerts

Register now to receive SearchSecurity.com-related news, tips and more, delivered to your inbox.
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

More News and Tutorials

Do you have something to add to this definition? Let us know.

Send your comments to techterms@whatis.com