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Oblivious transfer refers to a cryptographic protocol in which a sender possesses a set of data and a receiver queries the sender for a particular member of that set in such a way that the sender does not learn which member the receiver requests. In other words, the sender is oblivious of what information was actually transferred to the receiver.

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Public key encryption from (1,2)-oblivious transfer

Prove that any two rounds of (1,2)-oblivious transfer, that is semi honestly secure, imply public key encryption. My ideas so far: Let's say Alice samples two $n$ random strings $(x_1, x_2)$, a …