Homework Answers
So we calculate the key space sizes , that is for 112bit DES =
2^112 , for 56 bit DES is 2^56.
Now we have to find the ratio 2^112/2^56 = 2^56 ≈
7·10^16 , this times more time it takes for the given here
112-bit DES than 56-bit DES when we go for the brute force.
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