The word, cryptographie, was first recorded in France in the 1650’s. It is the study, practice and art of sending or solving coded messages and secret communications.
cryptographie - fr. Latin, cryptographia.
From the elements:
crypto - fr. Latin, crypta meaning ‘vault, cavern’ / Greek, kryptos meaning ‘hidden’;
-graphy - fr. French, graphie / Latin, graphia; meaning ‘writing’ and ‘field of study’.