TTP smartcard-based elgamal cryptosystem using threshold scheme for electronic elections

Authors:
Jordi Pujol-Ahulló;Roger Jardí-Cedó;Jordi Castellà-Roca;Oriol Farràs
Affiliations:
Departament d'Enginyeria en Informàtica i Matemàtiques, Tarragona, Spain;Departament d'Enginyeria en Informàtica i Matemàtiques, Tarragona, Spain;Departament d'Enginyeria en Informàtica i Matemàtiques, Tarragona, Spain;Departament d'Enginyeria en Informàtica i Matemàtiques, Tarragona, Spain
Venue:
FPS'11 Proceedings of the 4th Canada-France MITACS conference on Foundations and Practice of Security
Year:
2011

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Abstract

The private key of electronic elections is a very critical piece of information that, with an incorrect or improper use, may disrupt the elections results. To enforce the privacy and security of the private key, secret sharing schemes (or threshold schemes) are used to generate a distributed key into several entities. In this fashion, a threshold of at least t out of the n entities will be necessary to decrypt votes. We study in this work the feasibility of developing ElGamal cryptosystem and Shamir's secret sharing scheme into JavaCards, whose API gives no support for it.