What is the closest meaning of the phrase "cryptography" ? a. A technique of military communication Ob. study of principles / methods of deciphering ciphertext without knowing key Oc study of...

Extracted text: What is the closest meaning of the phrase "cryptography" ? a. A technique of military communication Ob. study of principles / methods of deciphering ciphertext without knowing key Oc study of encryption principles/methods O d. A technique of embedding one message into another 13:22 A a W ENG