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I need to know in an outsourced two party computation where honst $A$ and $B$ outsource their private and secure data to a malicious server, why we need to design a simulator that interacts with an adversary who exists in real model?

See the paper cited below as an example:

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you need to design the simulator in order to prove security. See this answer –  mikeazo May 13 at 12:03
The start of section 4 of the paper you linked to has a pretty good explanation. –  mikeazo May 13 at 12:04

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