Encrypt the message "HELLO MY DEARZ" using a transposition cipher with key: plaintext positions 2 4 1 3 → ciphertext positions 1 2 3 4.
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Correct answer: C. ELHL MDOY AZER
Explanation
Without spaces, the blocks are HELL, OMYD, EARZ. Taking characters 2, 4, 1, 3 of each gives ELHL, MDOY, AZER.
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