Networking / Beginners

Security Identifiers (SIDs)

Every user in Windows NT is represented by a unique security identifier (SID). SIDs for users always start with S-1-5-21 in Windows, denoting that they are issued by the NT identifying authority and that they may not be unique within the universe of SIDs. User SIDs are based on machine SIDs. For instance, S-1-5-21-1095672315-1787444531-3518664281 may be the SID of a machine. Users, in turns, will have SIDs based on the machine or domain SID, with a relative identifier (RID) appended. For example, the administrator on the machine will have a SID of S-1-5-21-1095672315-1787444531-3518664281-500.

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In this tutorial:

  1. Protecting Hosts
  2. Security Configuration Myths
  3. Myth 1: Security Guides Make Your System Secure
  4. Myth 2: If We Hide It, they Not Find It
  5. Myth 3: The More Tweaks, the Better
  6. Myth 4: Tweaks Are Necessary
  7. Myth 5: All Environments Should At Least Use <Insert Favorite Guide Here>
  8. Myth 6: "High Security" Is an End Goal for All Environments
  9. Myth 7: Start Securing Your Environment by Applying a Security Guide
  10. Myth 8: Security Tweaks Can Fix Physical Security Problems
  11. Myth 9: Security Tweaks Will Stop Worms/Viruses
  12. Myth 10: An Expert Recommended This Tweak as Defense in Depth
  13. Server Security Tweaks
  14. Software Restriction Policies
  15. Do Not Store LAN Manager Hash Value
  16. Anonymous Restrictions
  17. Security Identifiers (SIDs)
  18. Password Policies
  19. SMB Message Signing
  20. Networking LAN Manager Authentication Level
  21. TCP Hardening
  22. Restricted Groups
  23. Audit Settings
  24. Client Security Tweaks
  25. Firewalls
  26. IPsec Filters
  27. SafeDllSearchMode
  28. Local Administrator Account Control
  29. Limit Local Account Use of Blank Passwords to Console Logon Only
  30. Logon Events
  31. Allowed to Format and Eject Removable Media
  32. The Caution ListChanges You Should Not Make
  33. Crash on Audit Failure
  34. Clear Virtual Memory Page File
  35. Security Configuration Tools