Certificate-based verifiably encrypted signatures from pairings

  • Authors:
  • Zuhua Shao

  • Affiliations:
  • Department of Computer and Electronic Engineering, Zhejiang University of Science and Technology, No. 318, LiuHe Road, Hangzhou, Zhejiang 310023, PR China

  • Venue:
  • Information Sciences: an International Journal
  • Year:
  • 2008

Quantified Score

Hi-index 0.07

Visualization

Abstract

We propose a new verifiably encrypted signature scheme from pairings by choosing a certificate authority (CA) as an adjudicator. In this scheme, a certificate, or generally, a signature acts not only as the binding of the public key and its holder, but also as CA's guarantee against partiality in adjudication. Under the CDH assumption and in the random oracle model, we show that the new scheme is EUF-CMA secure in a stronger security model. In this security model, there are three types of inside adversaries with more power than those in previous verifiably encrypted signature schemes. The proposed scheme can solve the authentication problem of public keys and relax excessive reliance on the trustworthiness of the adjudicator so that the adjudicator only needs to be trusted by the signer. Hence, the fair exchange protocols of signatures based on the new scheme is more trustworthy and practical than the previous ones.