What will be the correct cipher text for the message “Hello” and K = ‘N’ using Auto key cipher.
Question
What will be the correct cipher text for the message “Hello” and K = ‘N’ using Auto key cipher.
Solution
To encrypt the message "Hello" using the Autokey Cipher with the key 'N', we need to follow these steps:
Step 1: Assign numerical values to the letters in the message and the key. We can use the convention A=0, B=1, C=2, and so on. In this case, "Hello" becomes [7, 4, 11, 11, 14] and 'N' becomes 13.
Step 2: Create the keystream. The first letter of the keystream is the key. The rest of the keystream is the original message. In this case, the keystream is [13, 7, 4, 11, 11].
Step 3: Add the message and the keystream together modulo 26. The resulting list of numbers is the encrypted message.
[7, 4, 11, 11, 14] (message) [13, 7, 4, 11, 11] (keystream) ------------------- (add modulo 26) [20, 11, 15, 22, 25]
Step 4: Convert the numbers back to letters to get the encrypted message. In this case, [20, 11, 15, 22, 25] becomes "Ulpwz".
So, the correct cipher text for the message “Hello” and K = ‘N’ using Auto key cipher is "Ulpwz".
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