Unconditionally secure oblivious transfer based on channel delays

  • Authors:
  • Kai-Yuen Cheong;Atsuko Miyaji

  • Affiliations:
  • Japan Advanced Institute of Science and Technology, Nomi, Ishikawa, Japan;Japan Advanced Institute of Science and Technology, Nomi, Ishikawa, Japan

  • Venue:
  • ICICS'11 Proceedings of the 13th international conference on Information and communications security
  • Year:
  • 2011

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Abstract

Without the use of computational assumptions, unconditionally secure oblivious transfer (OT) is impossible in the standard model where the parties are using a clear channel. Such impossibilities can be overcome by using a noisy channel. Recently, Palmieri and Pereira proposed a protocol based on random channel delays only. Their scheme is secure in the semi-honest model, but not in the general malicious model. In this paper we study oblivious transfer in the same setting but we improve the result to obtain a fully secure protocol in the malicious model.