Answer: CODES

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Rules we know 7 Answers
Secret stuff we know 2 Answers
Things to crack we know 2 Answers
Secret writings we know 1 Answer
Ciphers we know 3 Answers
They may be cracked we know 3 Answers
Secret messages we know 1 Answer
Programs we know 2 Answers
They're sometimes cracked we know 2 Answers
Area and zip we know 1 Answer
Morse and others we know 1 Answer
Cryptography topic we know 1 Answer
Cryptographers' creations we know 1 Answer
Works on a program we know 1 Answer
Things broken by the C.I.A. we know 1 Answer
Systems of signals we know 1 Answer
Systems of rules we know 1 Answer
Some are made of bars we know 1 Answer
Sets of regulations we know 1 Answer
Sets of principles we know 1 Answer
Secret languages we know 1 Answer
Secret communications we know 1 Answer
Regulations for builders we know 1 Answer
Protocols we know 1 Answer
Programmers' output we know 1 Answer
Prepares punch cards we know 1 Answer
Penal and Napoleonic we know 1 Answer
Morse et al. we know 1 Answer
Morse and zip, e.g. we know 1 Answer
Morse and zip we know 1 Answer
Morse and area we know 1 Answer
Message systems we know 1 Answer
Kin of ciphers we know 1 Answer
Hides the meaning we know 1 Answer
Features of secret messages we know 1 Answer
Encrypts we know 1 Answer
Encryptions we know 1 Answer
Disguises the meaning we know 1 Answer
Cryptography topics we know 1 Answer
Cryptographer's study we know 1 Answer
Cryptographer's creations we know 1 Answer
Crackers may be used on them we know 1 Answer
Buildings often have them we know 1 Answer

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