SO Code Busters Crossword

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Across
  1. 2. The original alphabet is encoded with a keyword and the replacement alphabet is in alphabetical order
  2. 3. A mathematical puzzle where the digits have been replaced by letters
  3. 5. A polyalphabetic ciphertext where you are given a key
  4. 6. Ordinary readable text before it is encrypted
  5. 7. A polygraphic substitution cipher based on linear algebra
  6. 9. A substitution cipher where each letter is mapped to its "numeric equivalent."
  7. 10. Either producing a decryption matrix or computing a decryption matrix
Down
  1. 1. A monoalphabetic rotation cipher that rotates each letter in the alphabet three letters up
  2. 4. Maps each letter in the alphabet to its opposite letter in the alphabet
  3. 8. A text written in code, or a symbol with a secret significance