Answer: INCODE

Possible questions:


Encrypted we know 2 Answers
Like some messages we know 4 Answers
Like secret messages we know 2 Answers
Unreadable we know 2 Answers
Uncracked? we know 1 Answer
Rendered unreadable we know 1 Answer
One way to communicate we know 1 Answer
Needing to be cracked? we know 1 Answer
Needing crackers, say we know 1 Answer

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