Question: 4. Let {fs}, fs: {0,1} + {0,1} be a secure PRP. Consider the family of permutations {f'}, fs: {0, 1}2n +{0,1}2n defined as follows: for

4. Let {fs}, fs: {0,1}" + {0,1}" be a secure PRP.

4. Let {fs}, fs: {0,1}" + {0,1}" be a secure PRP. Consider the family of permutations {f'}, fs: {0, 1}2n +{0,1}2n defined as follows: for any x, x' e {0,1}" ff (x || X') = f(x) || fs (2 x') (x || a' denotes the concatenation of x and x'). Show that {f} is not a secure PRP

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