Assignment: Maruf creates a pair of keys for himself. He chooses
p = 397 and q = 401. He also calculates n = pxq and φ(n). He then
chooses e = 343 and d = 12007. Show how Marshia can send a
message ‘NO’ to Maruf if she knows e and n using RSA. Assume
Marshia changes each character to a number (from 00 to 25), with
each character coded as two digits and then concatenates the two
coded characters and gets a four –digit number. Students need to
show the plaintext and ciphertext for encryption and decryption
of the messages