Code Busters Crossword

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Across
  1. 3. A backward cipher
  2. 6. A type of substitution cipher used for data encryption in which the original plaintext structure is somewhat concealed
  3. 9. A substitution cipher in which each letter is replaced by a sequence of 5 characters
  4. 10. A morse code cipher
Down
  1. 1. Uses the same method of encryption but normal word divisions are not retained
  2. 2. A shift cipher
  3. 4. A type of monoalphabetic substitution cipher
  4. 5. A zigzag cipher
  5. 7. A polygraphic substitution cipher based on linear algebra
  6. 8. A substitution cipher using normal words