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Prove that the following modications of basic CBC-MAC do not yield a secure MAC (even for xed-length messages): (a) Mac outputs all blocks t1,...,t`, rather
Prove that the following modications of basic CBC-MAC do not yield a secure MAC (even for xed-length messages): (a) Mac outputs all blocks t1,...,t`, rather than just t`. (Verication only checks whether t` is correct.)
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