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As the other answers already state here, game-based definitions are easier to write proofs for, but simulation-based definitions are often clearer in terms of the security guarantee that you get. The best example of this is IND-CPA (game-based definition) versus semantic security (simulation-based definition). Note that IND-CPA is really not a convincing ...


In the real-world protocol there is no simulator. There is a real-world adversary and it has access to the exact same (random) oracle as the honest parties. The simulator controls the random oracle in the ideal-model simulation only. This is not required by the definition, but is the way that things work. Essentially, the simulator plays the role of the ...

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