CSE 651 Homework 6 Due: Wednesday, June 2 by class time 1.Do problem 12.3 on the 5thedition (or 12.10 on the 4th) of Stallings. (This problem shows that CBC-MAC is not secure.) 2. 12011Consider CMAC( , , ):, where ||.IV (typically 0 )for 1 to 1 do()() returnNow suppose we uselinikiilklllm k kmmmmmncilcE cmcE cmkca random IV (rather than a fixed one) for each message, andlet the tag be IV,. Show that this variant of CMAC is not secure. (For simplicity, assume no padding.)(Hint : Given a legitimate ,CMAClkcm ,,( ) , construct a pair ( , ) such that
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