Towards Tight Security? Sample Clauses

Towards Tight Security?. In Sect. 4 we approach the attack from a more theoretical perspective, and describe the main limitations in proving security of GCLf1 ,f2 ,f3 beyond 22n/3. The quasi-formal discussion relies on equating executions of GCLf1 ,f2 ,f3 with a bipartite graph, and by drawing a parallel with Xxxxxxx’s mirror the- ory [20, 22, 26, 28] we indicate various issues in trying to prove security beyond 22n/3. The most notable one of these, namely the potential existence of four queries which alternatively collide on the input of Ek1 or output of Ek2 is pre- cisely the one exploited in our attack in 2n1/223n/4 queries. We also pinpoint where and how the current gap between a security lower bound of 22n/3 and an attack upper bound of 23n/4 arises. Most importantly, as the distinguisher can freely choose the value of the tweak for every query, it can set a certain distinguishing event with a significant probability.
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Related to Towards Tight Security?

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