Adaptive and Composable Non-committing Encryptions

Huafei Zhu, Tadashi Araragi, Takashi Nishide, Kouichi Sakurai

Abstract: In this paper, a new non-committing encryption protocol without failure during the course of a channel setup procedure is constructed and analyzed in the universally composable (UC) framework. We show that the proposed non-committing scheme realizes the UC-security in the presence of adaptive adversary assuming that the decisional Diffie-Hellman problem is hard.