Question: Encrypt the message this is an exercise using additive cipher with key = 20. Ignore the space between words. Decrypt the message to get the

Encrypt the message “this is an exercise” using additive cipher with key = 20. Ignore the space between words. Decrypt the message to get the original plaintext.

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a The ciphertext is NBCMCMUHYRYLWCMY as shown below b We ca... View full answer

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