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UC model, ideal functionalities -- interactions and optional inputs

zm flag

I have two question re ideal functionalities in the UC model.

First, is whether the functionality can ask a party for an input (the party doesn't need to be corrupted). Assume a functionality $F$ is called on input $x$ by a party $P$. Could $F$ ask party $P'$ to provide additional input $x'$? (whether $F$ asks $P'$ or not may depend on $F$'s state and $x$).

Second, could a functionality call take various number of inputs? E.g. in one case the call is only made by party $P$, in some other case both $P$ and $P'$ make a call?

All the best!

mangohost

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