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Crypt is a word meaning hidden. Therefore, cryptology is the study of hidden information, encryption means to make hidden, and cryptic is that something's meaning is hidden. Another word is cryptography, which means hidden writing.
The word 'hidden' can be a verb, being the past participle of 'hide', suggesting an action, e.g. "I have hidden the chocolate." It is also an adjective, describing the state of something, e.g. "What is the hidden meaning of this poem?"
hid
secretive, mysterious, concealed, covered,
obscures