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==Security==
The security of a two-party computation protocol is usually defined through a comparison with an idealised scenario that is secure by definition. The idealised scenario involves a [[Trusted_third_party|trusted party]] that collects the input of the two parties over [[secure channel]]s and returns the result if non of the parties chooses to abort. The cryptographic two-party computation protocol is secure, if it behaves no worse than this ideal protocol, but without the additional [[trust]] [[assumption]]s. This is usually modeled using a simulator. The task of the simulator is to act as a wrapper around the idealised protocol to make it appear like the cryptographic protocol. The simulation succeeds with respect to an [[information theoretic]], [[computationally bounded]] adversary if output of the simulator is equal to respectively [[computationally indistinguishable|Computational indistinguishability]] from the output of the cryptographic protocol.
==See also==
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