Plaintext: A1 (9)= ( 231131 =3x2 + 17x8] x8 = 18 = [13] mod 26 = MI Ciphertext: CIKK GE UW EROY 18x2 6 + 136 116 + 2001 Similarly, next block KK = SS and so on..... The Plaintext: MI SS IS SI PP IK