Caesar Cipher

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Across
  1. 2. Number of positions to move each letter tijgu
  2. 4. The number that determines how far to shift
  3. 7. Type of cipher that replaces letters with other letters
  4. 8. Process of converting plaintext to ciphertext
  5. 9. Reverse the encryption process
Down
  1. 1. The 26 letters used in English encoding
  2. 3. The original unencoded message
  3. 5. First name of the Roman general who used this cipher
  4. 6. Another name for the shifting technique used