• A fair and abuse-free contract signing protocol from Boneh-Boyen signature 

    Heidarvand, Somayed; Villar Santos, Jorge Luis (Springer Verlag, 2010)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    A fair contract signing protocol is used to enable two mistrusted parties to exchange two signatures on a given contract, in such a way that either both of them get the other party’s signature, or none of them gets anything. ...
  • Anonymous subscription schemes : a flexible fonstruction for on-line services access 

    González Vasco, Maria Isabel; Heidarvand, Somayed; Villar Santos, Jorge Luis (IEEE Press. Institute of Electrical and Electronics Engineers, 2010)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    In traditional e-cash systems, the tradeoff between anonymity and fraud-detection is solved by hiding the identity of the user into the e-coin, and providing an additional triggering mechanism that opens this identity in ...
  • Public verifiability from pairings in secret sharing schemes 

    Heidarvand, Somayed; Villar Santos, Jorge Luis (2009)
    Article
    Accés restringit per política de l'editorial
    In this paper we propose a new publicly verifiable secret sharing scheme using pairings with close relations to Shoenmakers’ scheme. This scheme is efficient, multiplicatively homomorphic and with unconditional verifiability ...