Now showing items 1-12 of 12

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

    Heidarvand, Somayed; Villar Santos, Jorge Luis (Springer Verlag, 2010)
    Conference report
    Restricted access - publisher's policy
    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. ...
  • An algebraic framework for Diffie-Hellman assumptions 

    Escala Ribas, Alex; Herold, Gottfried; Kiltz, Eike; Ràfols Salvador, Carla; Villar Santos, Jorge Luis (2017-01)
    Article
    Open Access
    We put forward a new algebraic framework to generalize and analyze Di e-Hellman like Decisional Assumptions which allows us to argue about security and applications by considering only algebraic properties. Our D`;k-MDDH ...
  • An algebraic framework for Diffie–Hellman assumptions 

    Escala Ribas, Alex; Herold, Gottfried; Kiltz, Eike; Ràfols Salvador, Carla; Villar Santos, Jorge Luis (2015-10-22)
    Article
    Open Access
    We put forward a new algebraic framework to generalize and analyze Diffie-Hellman like Decisional Assumptions which allows us to argue about security and applications by considering only algebraic properties. Our D`,k-MDDH ...
  • 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)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • Compartición de secretos en criptografía 

    Villar Santos, Jorge Luis; Padró Laimón, Carles; Sáez Moreno, Germán (Escola Tècnica Superior d'Enginyers de Telecomunicació de Barcelona, 1997)
    Article
    Open Access
  • Equivalences and black-box separations of Matrix Diffie-Hellman problems 

    Villar Santos, Jorge Luis (2017-02)
    Article
    Open Access
    In this paper we provide new algebraic tools to study the relationship between different Matrix Diffie-Hellman (MDDH) Problems, which are recently introduced as a natural generalization of the so-called Linear Problem. ...
  • Equivalences and Black-Box Separations of Matrix Diffie-Hellman Problems 

    Villar Santos, Jorge Luis (Springer, 2017)
    Conference lecture
    Open Access
    In this paper we provide new algebraic tools to study the relationship between different Matrix Diffie-Hellman (MDDH) Problems, which are recently introduced as a natural generalization of the so-called Linear Problem. ...
  • Matrix computational assumptions in multilinear groups 

    Morillo Bosch, M. Paz; Ràfols Salvador, Carla; Villar Santos, Jorge Luis (2015-04-20)
    External research report
    Open Access
    We put forward a new family of computational assumptions, the Kernel Matrix Di e- Hellman Assumption. Given some matrix A sampled from some distribution D `;k , the kernel as- sumption says that it is hard to nd \in the exponent
  • Métodos numéricos con MATLAB : aplicación a las telecomunicaciones 

    Villar Santos, Jorge Luis; Morillo Bosch, M. Paz (Edicions UPC, 2003)
    Book
    Restricted access to UB, UAB, UPC, UPF, UdG, UdL, URV, UOC, BC, UVic, UJI, URL, UIC users
    El contenido de este libro corresponde a una asignatura semestral de formación general sobre métodos numéricos en Ingeniería de Telecomunicación. La obra se estructura en tres partes. La primera contiene una introducción ...
  • Public verifiability from pairings in secret sharing schemes 

    Heidarvand, Somayed; Villar Santos, Jorge Luis (2009)
    Article
    Restricted access - publisher's policy
    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 ...
  • The Kernel Matrix Diffie-Hellman assumption 

    Morillo Bosch, M. Paz; Ràfols Salvador, Carla; Villar Santos, Jorge Luis (Springer, 2016)
    Conference lecture
    Open Access
    We put forward a new family of computational assumptions, the Kernel Matrix Diffie-Hellman Assumption. Given some matrix A sampled from some distribution D, the kernel assumption says that it is hard to find “in the exponent” ...
  • The Kernel Matrix Diffie-Hellman Assumption 

    Morillo Bosch, M. Paz; Ràfols Salvador, Carla; Villar Santos, Jorge Luis (2016-12)
    Article
    Open Access
    We put forward a new family of computational assumptions, the Kernel Matrix Diffie-Hellman Assumption. Given some matrix A sampled from some distribution D, the kernel assumption says that it is hard to find “in the exponent” ...