Non-committing Encryptions Based on Oblivious Naor-Pinkas Cryptosystems

  • Authors:
  • Huafei Zhu;Feng Bao

  • Affiliations:
  • I2R, A*STAR, Singapore;I2R, A*STAR, Singapore

  • Venue:
  • INDOCRYPT '09 Proceedings of the 10th International Conference on Cryptology in India: Progress in Cryptology
  • Year:
  • 2009

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Abstract

Designing non-committing encryptions tolerating adaptive adversaries, who are able to corrupt parties on the fly in the course of computation has been a challenge task. In this paper, we make progress in this area. First, we introduce a new notion called oblivious Naor-Pinkas cryptosystems that benefits us to extract the randomness used to generate local public keys and thus enable us to construct corresponding simulator for a given adaptive adversary in a real-world protocol. We then give a simple construction of non-committing encryptions based on oblivious Naor-Pinkas cryptosystems. We show that the proposed non-committing encryption scheme is provably secure against an adaptive PPT adversary assuming that the decisional Diffie-Hellman problem is hard.