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What is a SID (Security ID)?

What is a SID (Security ID)?

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SID stands for security identifier and is an internal value used in Microsoft NT systems to uniquely identify a user or a group. A SID contains:

  • User and group descriptors
  • Revision level
  • 48-bit ID authority
  • Variable sub authority values

For more information go to Micosoft SDK documentation.

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This was first published in February 2002

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