Oblivious Multi-variate Polynomial Evaluation

  • Authors:
  • Gérald Gavin;Marine Minier

  • Affiliations:
  • ERIC laboratory, Université Lyon 1 (UCBL), Villeurbanne, France 69622;CITI Laboratory - INSA de Lyon, Lyon University, Villeurbanne Cedex, France 69621

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

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Abstract

In this paper, we propose a protocol for Oblivious Polynomial Evaluation (OPE) considering a multi-variate polynomial. There are two parties, Alice who has a secret multi-variate polynomial f and Bob who has an input x = (x 1,...,x T ). Thus, Bob wants to compute f(x) without any information leakage: Alice learns nothing about x and Bob learns only what can be inferred from f(x). In [4], the authors proposed a solution for this problem using Oblivious Transfer (OT) protocol only. In this paper, we propose efficient OPE protocols for the multi-variate case based upon additive and multiplicative homomorphic encryption schemes defined on the same domain. Our protocol only reveals the number of monomials.