Question: Let F : { 0 , 1 } n times { 0 , 1 } n - > { 0 , 1 } n

Let F : {0,1}n \times {0,1}n ->{0,1}n be a secure PRF. We construct a new PRF F as follows: F (x)= Fk(x) Fk(k). Is F' a secure PRF?

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