Simple Adaptive Oblivious Transfer without Random Oracle
Adaptive oblivious transfer (OT) is a two-party protocol which simulates an ideal world such that the sender sends M 1 , *** , M n to the trusted third party (TTP), and the receiver receives $M_{\sigma_i}$ from TTP adaptively for i = 1,2, *** k . This paper shows the first pairing-free fully simulatable adaptive OT. It is also the first fully simulatable scheme which does not rely on dynamic assumptions. Indeed our scheme holds under the DDH assumption.