Question: List two modes of encryption that do not allow random access to the ciphertext blocks. This means that it is not sufficient for a hacker

List two modes of encryption that do not allow random access to the ciphertext blocks. This means that it is not sufficient for a hacker to obtain the i-th plaintext P_i only having access to the i-th cyphertext block C_i. Instead, obtaining Pi requires access to other ciphertext blocks in addition to C_i.

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