CSE 651 Homework 6

CSE 651 Homework 6 - CSE 651 Homework 6 Due: Wednesday,...

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CSE 651 Homework 6 Due: Wednesday, June 2 by class time 1. Do problem 12.3 on the 5 th edition (or 12.10 on the 4 th ) of Stallings. (This problem shows that CBC-MAC is not secure.) 2.   12 0 1 1 Consider CMAC( , , ): , where | | . IV (typically 0 ) for 1 to 1 do ( ) ( ) return Now suppose we use li n i k i i l k l l l m k k m m m m m n c il c E c m c E c m k c    a random IV (rather than a fixed one) for each message, and let the tag be IV, . Show that this variant of CMAC is not secure. (For simplicity, assume no padding.) (Hint : Given a legitimate ,CMAC l k c m   , , ( ) , construct a pair ( , ) such that
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