Question: Let F : { 0 , 1 } n { 0 , 1 } 2 n { 0 , 1 } 2 n be a

Let F:{0,1}n{0,1}2n{0,1}2n be a pseudorandom function and let G be a length-doubling PRG. Prove that Fk'(x):=Fk(G(x)) is not necessarily a PRF.
Hint: Consider a PRG G(s)=s2 where s=s1||s2
Let F:{0,1}n{0,1}2n{0,1}2n be a pseudorandom function and let G be a

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