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### What is the security of multiple encryption using Even–Mansour scheme (XEX)?

This is better known as iterated Even-mansour or key-alternating cipher. From Theorem 1 of Hoang-Tessaro we have  \mathrm{Adv}^{\pm\mathrm{prp}}_{\mathrm{KAC}[\pi,t]} \le \frac{4^tqp_1\cdots p_t}{2^{...
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These are fairly standard. $\boxplus$ is modular addition, $\oplus$ is XOR, $\lll$ is left rotate, and $\ll$ is left shift. Others you may see include $\land$ (logical AND) and $\lor$ (logical OR), as ...