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Here is a concrete example of how the receiver could extract information about the senders input: Assume the circuit to be evaluated is the simple circuit computing $(x \oplus (y \wedge z)) = w$, where $x, y$ is the input of the sender and $z$ the input of the receiver. Note, that $w$ and $z$ alone does not reveal the value of $y$ (you can write down the ...


The problem is because sender has provided the receiver with a garbled circuit in which the sender's inputs are hard coded (or has provided keys for those inputs, which is morally the same). If the receiver has both keys for each input wire then it is trivial to narrow down the possible values of the sender's input. Consider a concrete example, the ...

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