Problemencrypt the message this is an exercise using one of, Ask an Expert

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Problem

Encrypt the message "this is an exercise" using one of the following ciphers. Ignore the space between words. Decrypt the message to get the original plaintext.

a. Additive cipher with key = 20

b. Multiplicative cipher with key = 15

c. Affine cipher with key = (15.20).

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