CrosswordMint
Enigmatic Keys to Hidden Messages
Moderate difficulty suitable for most players
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Across
  • 1. Chinese cipher method using numeric substitution
  • 2. Polyalphabetic cipher using a repeated keyword
  • 4. Ancient alphabet sometimes used as cryptic writing symbols
  • 6. Dot and dash system that transmits messages by sound or light
  • 8. Well-known shift cipher named after Julius
  • 9. Mathematician who helped decrypt Enigma secrets
  • 11. Biblical substitution cipher that reverses the alphabet
  • 12. Polybius square cipher combined with fractionation
  • 15. Type of cipher relying on a common text
Down
  • 3. Cipher using a 5x5 letter grid introduced in the 19th century
  • 5. Thirteen-letter Caesar shift often used in puzzles
  • 7. Ancient Spartan code using a wrapped strip of parchment
  • 10. Simple ancient shift cipher named for a Roman leader
  • 13. Sculpture with an encrypted message at CIA headquarters
  • 14. Famous WWII machine cipher once thought unbreakable
  • 16. Code talkers’ language used during WWII communications

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