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To encrypt plaintext using a clock cipher, use a colon (:) to separate each number (which corresponds to every letter of your plaintext). Then, every word will be separated using two zeros as in denoting o'clock (00).
Example:
Plaintext: MEET ME IN AN HOUR Ciphertext: 12:4:4:19:00:12:4:00:8:13:00:AM:13:00:7:14:20:17
