A machine that can crack symmetric cipher keys by brute force is tested with three different samples of ciphertext. Each sample was encrypted with the same cipher. A different key was used to produce each sample, but the key size was the same for all samples.
In the three trials, the times taken to find the key were recorded as 22.8 hours, 30.9 hours and 42.6 hours. Explain why the times to find the key vary
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