Oblivious Transfer Clause Samples
The Oblivious Transfer clause defines a cryptographic protocol in which a sender transmits one of potentially many pieces of information to a receiver, but remains unaware of which piece was actually received. In practice, this means the sender prepares multiple messages, and the receiver selects and obtains only one, without the sender knowing which was chosen. This mechanism is commonly used in secure multi-party computations to protect privacy and prevent information leakage, ensuring that sensitive data is only accessible to authorized parties while keeping the sender oblivious to the receiver's selection.
Oblivious Transfer. (OT) Informally, 1-out-of-2 Oblivious Transfer (see [CO15] and citations therein) enables one party (the sender) to transfer ex- actly one of two secrets to another party (the receiver). The receiver chooses (by index 0 or 1) which secret she wants. The security of the OT protocol guarantees that the sender does not learn this choice bit, and the receiver does not learn anything about the other secret.
Oblivious Transfer. The Oblivious Transfer (OT) functionality was defined by ▇▇▇▇▇▇▇ et al. [CLOS02]. We recall it in Figure 16. Password-Authenticated Key Exchange. The initial PAKE functionality pwKE has been defined by ▇▇▇▇▇▇▇ et al. [CHK+05]. We recall it in Figure 17. We stress that this functionality immediately leaks the result of the TestPwd-query, which models explicit authentication; when the adversary tries a password, it learns whether the guess was correct or not. and the players S (the sender) and R (the receiver) via the following queries: The functionality FOT is parameterized by a security parameter λ. It interacts with an adversary S – Upon receiving a query (Send, sid, x0, x1) from S, where x0, x1 ∈ {0, 1}λ, record the tuple (x0, x1). – Upon receiving a query (Receive, sid, i) from R: If there is a record (x0, x1), then send (sid, xi) to R and sid to S, and halt. Otherwise, ignore the query.