Related Clues:

• ''One if by land, two if by sea,'' e.g.
• One if by land, two if by sea, e.g.
• Something cracked
• Make cryptograms
• Turn 'this' into '_ .... .. ...,' e.g.
• Programmer's creation
• It's broken after some thought
• Spy-school subject
• UPC part
• Cracker's target
• It may be cracked by a spy
• Camouflage a message
• Programmer's concern
• Write cryptograms
• It can't be understood until it's broken