use the additive cipher with key =15 to encript the message ''hello''
Question
use the additive cipher with key =15 to encript the message ''hello''
Solution
Sure, here's how you can use the additive cipher with key = 15 to encrypt the message "hello":
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First, you need to convert each letter in the message to its corresponding numerical value. In the English alphabet, 'a' is 0, 'b' is 1, 'c' is 2, and so on, up to 'z' which is 25. So, for "hello", we get: h=7, e=4, l=11, l=11, o=14.
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Next, add the key (15 in this case) to each of these numerical values. If the sum is greater than 25, subtract 26 from it to get a number within the 0-25 range. This is because there are 26 letters in the English alphabet. So, we get: 7+15=22, 4+15=19, 11+15=26 (subtract 26 to get 0), 11+15=26 (subtract 26 to get 0), 14+15=29 (subtract 26 to get 3).
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Finally, convert these numerical values back to letters to get the encrypted message. So, 22=w, 19=t, 0=a, 0=a, 3=d.
Therefore, the message "hello" encrypted using the additive cipher with key = 15 is "wtaad".
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