You searched for: “cryptography
cryptography (s) (noun), cryptographies (pl)
1. The science or study of hidden writing; especially, unknown codes and ciphers: The objective of cryptography is to prevent information from falling into the hands of those who would use it against us.
2. The procedures and methods of making and using secret languages: If a new word for cryptography were to be invented today, it would probably be "secret communications."
A man is trying to interpret a cryptographic message.
A spy is deciphering a coded message.

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