Problem 5 [Playfair Cipher, 33 pts.): Eve has intercepted the following plaintext and ciphertext pair (do not try to make sense of the plaintext): boldstepforonesoyoungbigshot NBMCTEPXQFQBTCHTHEWCTNABHIBO Eve suspects a playfair cipher. 1. Reconstruct the key matrix used. 2. Guess the keyword that was used to construct the key matrix