Question: If a key is 4 3 bits long, how much longer will it take to crack it by exhaustive search if it is extended to

If a key is 43 bits long, how much longer will it take to crack it by exhaustive search if it is extended to 50 bits?
256 times as long
14 times as long
128 times as long
7 times as long
If a key is 43 bits long, how much longer will

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