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Crossword solution:

13 clues for "CODES":

  1. Secret messages.
  2. Systems of signals
  3. Ciphers
  4. Cryptographers' creations
  5. Morse et al
  6. 'One if by land, two if by sea' and others
  7. Secret signals.
  8. Sets of rules.
  9. Signals for sending messages.
  10. Signals, spy style.
  11. Signal systems.
  12. Things broken by the C.I.A.
  13. Zip, et al.