Question: Question Four Encrypt the message THIS IS AN EXERCISE using a shift cipher with a key of 20. Ignore the space between words. Decrypt the

Question Four

  1. Encrypt the message "THIS IS AN EXERCISE" using a shift cipher with a key of 20.

Ignore the space between words. Decrypt the message to get the original plaintext.

  1. Another asymmetric-key algorithm is based on elliptic curves. Explain the algorithms based on elliptic curves.

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