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In this paper we propose a number of KEM-based protocols to establish ashared secret between two parties, and study their resistance overunauthenticated channels. This means analyzing the security of the protocolitself, and its robustness against Man-in-the-Middle attacks. We do this byconstructing a variation of known unauthenticated models that applies thetechniques used to constructed the protocols, and formalize their securityunder this model. We compare them with their KEX-based counterparts tohighlight the differences that arise naturally, due to the nature of KEMconstructions, in terms of the protocol itself and the types of attacks thatthey are subject to. We provide practical go-to KEM-based protocols instancesto migrate to, based on the conditions of currently-in-use KEX-based protocols.

Provably secure KEM-based protocols over unauthenticated channels