Optimum secret sharing scheme secure against cheating

  • Authors:
  • Wakaha Ogata;Kaoru Kurosawa

  • Affiliations:
  • Himeji Institute of Technology, Hyogo, Japan;Tokyo Institute of Technology, Tokyo, Japan

  • Venue:
  • EUROCRYPT'96 Proceedings of the 15th annual international conference on Theory and application of cryptographic techniques
  • Year:
  • 1996

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Abstract

Tompa and Woll considered a problem of cheaters in (k, n) threshold secret sharing schemes. We first derive a tight lower bound on the size of shares |νi| for this problem: |νi|≥ (|S|-1)/δ+1, where νi denotes the set of shares of participant Pi, S denotes thr set of secrets, and δ denotes the cheating probabilily. We next present an optimum scheme which meets the equality of our bound by using "difference sets."