cryptogram Synonyms

secret writing cryptograph braintwister tickler teaser subtlety stumper stickler steganography sphinx secret secrecy rune roun riddle rebus twister puzzler awkward problem tough nut to crack coding Codes ciphertext chiller brainteaser cliffhanger whodunit isogram koan antigram thriller puzzlement puzzle cryptography cryptogamic cryptogamia conundrum code cipher charade bewilderment argument anagram ambiguity affair abstrusity cryptology cypher enigma problem