Simple Adaptive Oblivious Transfer without Random Oracle

摘要

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_(σ_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.