par Dossogne, Jérôme ;Markowitch, Olivier ;Lafitte, Frédéric
Référence GI-Edition. Lecture Notes in Informatics, 205, page (127-141)
Publication Publié, 2012
Article révisé par les pairs
Résumé : In this paper we present how multi-party designated verifier signatures can be used as generic solution to the coercion-freeness problem in electronic voting schemes. We illustrate the concept of multi-party designated verifier signatures with an enhanced version of Ghodosi and Pieprzyk [GP06]’s threshold signature scheme. The proposed scheme is efficient, secure, allows distributed computations of the sig- nature on the ballot receipt and can be parameterized to set a threshold on the number of required signers. The security of the designated verifier property is evaluated using the simulation paradigm [Gol00] based on the security analysis of [GHKR08]. Unlike previously provable schemes ours is ideal, i.e. the bit-lenght of each secret key share is bounded by the bit-lenght of the RSA modulus.