Answer:

CODES

AnswerCrossword Clue
CODESArea and zip, for example
CODESMorse and Napoleonic
CODESBodies of laws
CODESWritings to crack
CODESSets of laws
CODESThey may be cracked
CODESSystems of rules
CODESSets of regulations
CODESZip and country
CODESEncrypts
CODESFeatures of secret messages
CODESThings to crack
CODESCryptographers' creations
CODESProgrammers' output
CODESWorks on a program
CODESZip and area
CODESRegulatory systems
CODESSecret languages
CODESSecurity precautions
CODESSecret stuff
CODESCryptography creations
CODESThings broken by Alan Turing
CODESEnciphers
CODESInternational and Morse
CODESArea numbers
CODESCiphers
CODESEncryptions
CODESSecret writings
CODESMorse et al.
CODESSecret messages
CODESRegulations for builders
CODESMorse and others
CODESSets of principles
CODESSystems of signals
CODESSome are made of bars
CODESCryptographer's creations
CODESPrograms
CODESCiphers.
CODESFormularies.
CODESSignal systems.