5.14. Given multiple plaintext–ciphertext pairs, your objectiveis to attack an en- cryption scheme based upon multipleencryptions.
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You want to break an encryption system E, which makes use oftriple AES-192 encryption (e.g. block length n = 128 bit, key sizeof k = 192 bit). How many tuples (xi , yi ) with yi = eK (xi ) doyou need to level down the probability of finding a key K, whichmatches the condition yi = eK(xi) for one particular i, but failsfor most other values of i (a so called false positive), to Pr(K′̸= K) = 2−20?
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What is the maximum key size of
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