Quantum Oblivious Transfer with Reusable Bell State

In cryptography, oblivious transfer (OT) is an important multi-party cryptographic primitive and protocol, that suitable for many upper-layer applications, such as secure computation, remote coin-flipping, electrical contract signing exchanging secrets simultaneously. However, some no-go theorems have been established, indicating one-out-of-two quantum (QOT) protocols with unconditional security are impossible. Fortunately, QOT using the concept of Crépeau’s reduction demonstrated not to conform Lo’s theorem, but these require more resources generate classical keys all-or-nothing construct QOT. This paper proposes a novel efficient which uses directly instead wasting unnecessary keys. The proposed protocol covered by it able check sender’s loyalty avoid attack from receiver. Moreover, entangled state reusable, so can provide services participants when necessary. Compared other protocols, secure, efficient, flexible, only prevent external internal attacks, also reduce required resource distribution time.