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Approach 1 The simplest way of doing this is for the receiver, with choice $j \in \{1,\dots,n\}$, to input $1$ in the $j$-th 1-out-of-2 OT and $0$ elsewhere. The sender, with input $(x_1, \dots, x_n)$, inputs $(0,x_i)$ in the $i$-th OT. Approach 2 An alternative protocol (that just came out of a discussion with a colleague, and seems to be actively ...


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Tung Chou and Claudio Orlandi created the most efficient 1-out-of-n OT protocol to date, based on an 1-out-of-2 OT protocoln, named The Simplest Protocol for Oblivious Transfer. You can read more about it here.



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