A Provably Secure t-out-of-n Oblivious Transfer Mechanism based on Blind Signature

[[abstract]]Due to the rapid development of the Internet, an increasing number of applications can be implemented using oblivious transfer (OT) as a sub-protocol, such as privacy-preserving auction, secrets exchange, data mining, and e-commerce. Considering the practicability of an OT mechanism, we think that it is also necessary to discuss how to convince a chooser of the integrity and origin of chosen secrets, except for accuracy,privacy of the sender, and privacy of the chooser. In this paper, we redefine the requirements of a well-designed OT scheme and propose a novel t-out-of-n OT mechanism (OT n T ) based on blind signature. The accuracy of our OT n t mechanism is demonstrated according to the BAN logic. Furthermore, we adopt the problem reduction to prove the security of our OT n t mechanism. The analyses demonstrate that our proposed mechanism can fulfill all requirements that we redefined and be suitable for further application