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Let DES(k, m) be the DES encryption of a message m under key k. Given...

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Let DES(k, m) be the DES encryption of a message m under key k. Given a ciphertext c, attacker A has the following algorithm to find the key: She randomly chooses a key ki and tests if DES(k,m) = c ? She keeps on repeating with different keys and stops when this condition is satisfied. What is the probability that she finds a wrong key (k' E k)

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