Answer the following two parts? 10 points Let E_(k)(m),D_(k)(c) be a block cipher. Fischer Spiffy Mixer (FSM) mode encrypts a sequence of message blocks m_(1),m_(2),dots, by the sequence of ciphertext blocks c_(1),c_(2),dots using the following method: c_(i)=m_(i-1)o+E_(k)(m_(i)o+c_(i-1)),quad i >= 1 m_(0) and c_(0) are fixed (public) initialization vectors. (a) Describe how decryption is performed. (b) Suppose ciphertext block c_(i) is damaged in transit. Which plaintext blocks become undecipherable as a result? Explain. Your answer