Hard-to-crack puzzle
Let's find possible answers to "Hard-to-crack puzzle" crossword clue. First of all, we will look for a few extra hints for this entry: Hard-to-crack puzzle. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.
Related clues
- Mysterious sort
- ____ machine, encryption device used by the Germans in WWII to transmit coded messages
- Mechanical encryption device patented by German engineer Arthur Scherbius in 1918, used by the German military before and during the Second World War
- ––– machine, an electro-mechanical rotor machine used for the encryption and decryption of secret messages
- 'The Imitation Game' encryption machine
Possible answers
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