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Let's say that someone has designed a block cipher operation mode as C i = C i-1 XOR E K (P i ) P 0

Let's say that someone has designed a block cipher operation mode as

C_i = C_i-1 XOR E_K(P_i)

P₀ = IV

a. If an error happened to P3 before encryption, through how many blocks of ciphertext is the error propagated? Which blocks of plaintext could not be recovered correctly at the receiver? Please explain.

b. Is it possible to execute encryption in parallel? How about decryption? Justify your answer.

c. How do you think about the design of this block cipher operation design? Is it usable? Justify your answer.

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