Alice encrypted a critical document using AES-128 in CBC mode with an IV of all...
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Alice encrypted a critical document using AES-128 in CBC mode with an IV of all zeros. She accidentally deleted the encryption key but still has the ciphertext and IV. Bob, a cryptanalyst, tells Alice that she may still be able to recover the plaintext under certain conditions.
Which of the following conditions would allow Alice to recover her data?
a) The ciphertext was created using a weak key schedule in AES. b) The same plaintext was encrypted multiple times with the same key. c) She remembers partial values of the key, reducing brute-force attempts. d) The plaintext has a highly predictable structure, making a chosen-plaintext attack feasible.
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