Consider the following construction for a MAC function: MAC(M) = Hreal(M?k) . (3) Is it secure? Cont

Consider the following construction for a MAC function: MAC(M) = Hreal(M∥k) . (3) Is it secure? Contrast this construction to Hreal(k∥M). (Hint: What could be a problem with the construction given by expression (3) if you would be able to find M and M ̸= M′ such that Hreal(M) = Hreal(M′)?)

 

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