Linear integer secret sharing and distributed exponentiation

  • Authors:
  • Ivan Damgård;Rune Thorbek

  • Affiliations:
  • BRICS, Dept. of Computer Science, University of Aarhus;BRICS, Dept. of Computer Science, University of Aarhus

  • Venue:
  • PKC'06 Proceedings of the 9th international conference on Theory and Practice of Public-Key Cryptography
  • Year:
  • 2006

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Abstract

We introduce the notion of Linear Integer Secret-Sharing (LISS) schemes, and show constructions of such schemes for any access structure. We show that any LISS scheme can be used to build a secure distributed protocol for exponentiation in any group. This implies, for instance, distributed RSA protocols for arbitrary access structures and with arbitrary public exponents.