Behind Closed doors

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Across
  1. 4. robin was this
  2. 5. make secure code
  3. 9. nameless
  4. 10. doubting thomas
  5. 11. clear of information
Down
  1. 1. encrypted currency
  2. 2. in the dark
  3. 3. pass word
  4. 6. upper room
  5. 7. unending number
  6. 8. attest to
  7. 12. mightier than sword