Oblivious Transfer (OT) is a cryptographic primitive in which a sender transfers some of potentially many pieces of information to a receiver. The sender doesn’t know which pieces of information have been transferred.
Oblivious transfer is central to many of the constructions for secure multiparty computation. In its most basic form, the sender has two secret messages as inputs,
m_0,m_1; the receiver has a choice bit
c as input. At the end of the 1-out-of-2 OT protocol, the receiver should only learn message
m_c, while the sender should not learn the value of the receiver’s input