Question: Show that F 2 ( k , x ) : = F ( k , x ) | F ( k , F (

Show that F2(k, x) := F(k, x)\| F(k, F(k, x)) is not a secure PRF. Here \| means the concatenation of the two outputs. Hint: your adversary A2 will query F2 at two inputs, where the second query depends on the answer to the first query

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