Question: A hacker claims to be able to launch a brute force attack against a 56-bit DES key that will identify the key within 30 hours.

A hacker claims to be able to launch a brute force attack against a 56-bit DES key that will identify the key within 30 hours. How many keys must be tried per second in order to exhaust the DES key space within 30 hours? How many hours would it take to exhaust a key space of 2156 if keys are tried at this same rate?

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