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Security classifications

Everyone working in Defence needs to know how to classify and mark information correctly.

How to classify information

  • What we use in Defence
  • Understand OFFICIAL, SECRET and TOP SECRET
  • Classifying large amounts of data

How to mark information

  • How to mark OFFICIAL information
  • Use OFFICIAL-SENSITIVE correctly
  • How to mark SECRET and TOP SECRET information

Publishing content online

  • Working in the open in Defence
  • Keep information secure and people safe
  • What you must not publish online

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