Question: Q 7 : KeyGen ? 4 , Tag ? 4 , Verify { : ? 4 ) is defined as follows: KeyGen ? 4 is

Q7: KeyGen ?4, Tag ?4, Verify {:?4) is defined as follows:
KeyGen ?4 is identical to KeyGen ?1, and it outputs a key k.
Tag4[k,(m1,m2)] first runs Tag1(k,m1) and obtains 1 and it
runs Tag2(k,m2) and obtains 2. The final tag is
:=1o+2
Is 4 a secure MAC? Briefly explain why. (10 pts)
Q7: KeyGen ?4, Tag ?4, Verify {:?4) is defined as follows:

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