cryptogram Synonyms

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