How many hours would it take on average to find that des, Mechanical Engineering

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How many hours would it take on average to find that des

Suppose you have a processor that can perform a single DES encryption or decryption operation in 2^-26 seconds. Suppose you also have a large number of plaintext-ciphertext pairs for DES under a single, unknown key. How many hours would it take, on average, to find that DES key, using an exhaustive search approach and a single processor? How many hours would it take, on average, to find that DES key, using an exhaustive search approach and a collection of 2" processors?

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