Here is another encryption/decryption exercise. For this exercise, I have provided a word that will serve as the key. To get you started: Easy = GXTW (Once you figure out the pattern to this, you can do the following): 3a. Encrypt this plaintext:?Cryptography is the art of secret writing.3b. Decrypt the following ciphertext: ALVAC KPLNV GGIEU RJBXY AVPSR OBAVF DC