security technology

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Across
  1. 3. layer
  2. 6. encryption scheme
  3. 9. system
  4. 10. control protocol
  5. 12. reads your mail
Down
  1. 1. layer
  2. 2. private network
  3. 4. key distribution
  4. 5. layer
  5. 7. protocol/internet layer
  6. 8. intercepts your mail and modify
  7. 9. mail and sign your name
  8. 11. risk