Given the following mathematical formula of the encryption algorithm for a block cipher mode: - Encryption c1ci=Ek(m1IV)=Ek(mimi1ci1),fori2 We have encrypted a three block message with this mode. A one-bit error occurred in the second ciphertext block. a) Write the mathematical formula for the decryption algorithm. b) Draw a mode decryption diagram that shows which plaintext bits are affected by error propagation