Question: : Let G: { 0 , 1 } ^ n - > { 0 , 1 } ^ n is a PRG . We define

: Let G:{0,1}^n->{0,1}^n is a PRG. We define H_k (x)=G(k)x, is H_k a PRF? If yes, explain why; if not, give an explicit attack

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