Some Digital Signature Schemes with Collective Signers 

    Herranz Sotoca, Javier (Date of defense: 2005-04-15)

    Digital signatures are one of the most important consequences of the appearance of public key cryptography, in 1976. These schemes provide authentication, integrity and non-repudiation to digital communications. <br/>Some ...

    Una Formalització de les construccions geomètriques 

    Tramuns Figueras, Eulàlia (Date of defense: 2012-07-18)

    Geometric constructions have been studied by mathematicians from ancient Greece until now. Although most attention has been given by the ruler and compass, during the last decades interest in this subject has revived, and ...