Simple Adaptive Oblivious Transfer without Random Oracle

  • Authors:
  • Kaoru Kurosawa;Ryo Nojima

  • Affiliations:
  • Ibaraki University, Japan;NICT, Japan

  • Venue:
  • ASIACRYPT '09 Proceedings of the 15th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
  • Year:
  • 2009

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Abstract

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.