Let Ek(m), Dk(c) be a block cipher. Fischer Spiffy Mixer (FSM) mode encrypts a sequence of message blocks m1, m2, . . . , by the sequence of ciphertext blocks c1, c2, . . . using the following method: ci = mi-1 ? Ek(mi ? ci-1), i = 1 m0 and c0 are fixed (public) initialization vectors. (a) Describe how decryption is performed. (b) Suppose ciphertext block ci is damaged in transit. Which plaintext blocks become undecipherable as a result? Explain.
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