Related Clues:
- Programmers' output
- Sets of regulations
- Bank vaults
- Keepers of jewels
- Crackers' targets
- 'One if by land, two if by sea' and others
- Cryptography topic
- Regulations for builders
- Sets of rules or cryptograms
- Word systems devised to create secrecy
- It may be hard to decipher how to be firm with a boy
- Poems by the hundred need to be deciphered
- Must be worth a lot to have to be made so secure in them
- Containers that may be cracked
- Works on a program