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You are evaluating a symmetric encryption algorithm that supports highly variable key lengths and determined that it would take an attacker three years on average

You are evaluating a symmetric encryption algorithm that supports highly variable key lengths and determined that it would take an attacker three years on average to crack an 80-bit key. If you wanted an average cracking time of 12 years, what is the minimum key length? Choose the best response.
a.
160 bits
b.
82 bits
c.
128 bits
d.
320 bits

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