During a cryptographic audit of a legacy system, a security analyst observes that an outdated block cipher is leaking key-related information when analyzing large sets of plaintext–ciphertext pairs. What approach might an attacker exploit here?
CEH covers classical cryptanalytic attacks, including linear cryptanalysis, which uses statistical correlations between plaintext and ciphertext to infer bits of the secret key. If a cipher leaks structural patterns across many data samples, linear approximations can be computed to break the cipher.
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