Question: How long does a brute force approach take on average to crack a key of 57 bits using a PC that is capable of performing

How long does a brute force approach take on average to crack a key of 57 bits using a PC that is capable of performing 1000 decryptions permillisecond?

How about using a supercomputer that is capable of performing 10⁶decryptions per microsecond?

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