Question: Let F be a secure PRF , and let m in { 0 , 1 } in be a fixed ( therefore known to the

Let F be a secure PRF, and let m in {0,1}in be a fixed (therefore known to the adversary) string. Define the new function
Fm(k,x)= F(k,x) F(k,m).
Show that Fm is not a secure PRF. Describe a distinguisher and compute its advantage.

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