Distributed paillier cryptosystem without trusted dealer

  • Authors:
  • Takashi Nishide;Kouichi Sakurai

  • Affiliations:
  • Department of Informatics, Kyushu University, Fukuoka, Japan;Department of Informatics, Kyushu University, Fukuoka, Japan

  • Venue:
  • WISA'10 Proceedings of the 11th international conference on Information security applications
  • Year:
  • 2010

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Abstract

We propose a distributed key generation protocol for the threshold Paillier cryptosystem. Often in the multiparty computation based on the threshold Paillier cryptosystem, the existence of a trusted dealer is assumed to distribute secret key shares, but it can be a single point of attack, so it is not preferable. Building on the threshold Paillier cryptosystem with a trusted dealer, we show how to eliminate the trusted dealer by robust distributed key generation without using safe primes.