crypt (3) | (noun) - from the Greek word = an underground room or vault often used as a burial place. |
cryptic (3) | (adj.) - from the Greek word = something which is ambiguous or has a hidden meaning. Cryptically is the adverb form. |
cryptogram (5) | (noun) - hidden + letter = a secret message written in a code or cipher. |
cryptography (4) | (noun) - hidden + writing = the process of writing or decoding secret messages. A cryptographer is a person who is good at this. |
decrypt (5) | (verb) - reverse, from + hidden = decode or translate a secret message. Decryption is the noun form. |
encrypt (4) | (verb) - in, into + hidden to encipher or encode a message. Encryption is the noun form. |