Now showing items 1-20 of 40

    • A cryptographic solution for private distributed simple meeting scheduling 

      Herranz Sotoca, Javier; Matwin, Stan; Meseguer González, Pedro; Nin Guerrero, Jordi (IOS Press, 2009)
      Conference report
      Open Access
      Meeting scheduling is a suitable application for distributed computation motivated by its privacy requirements. Previous work on this problem have considered some cryptographic and conceptually clear approach to solve a ...
    • Attacking pairing-free attribute-based encryption schemes 

      Herranz Sotoca, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Article
      Open Access
      Combining several results that have been published in the last years, it is known that it is impossible to design simple and secure attribute-based encryption schemes that work in (classical) settings like the RSA or the ...
    • Attribute selection in multivariate microaggregation 

      Nin Guerrero, Jordi; Herranz Sotoca, Javier; Torra i Reventós, Vicenç (2008)
      Conference report
      Restricted access - publisher's policy
      Microaggregation is one of the most employed microdata protection methods. The idea is to build clusters of at least k original records, and then replace them with the centroid of the cluster. When the number of attributes ...
    • Attribute-based encryption implies identity-based encryption 

      Herranz Sotoca, Javier (2017-11-01)
      Article
      Open Access
      In this study, the author formally proves that designing attribute-based encryption schemes cannot be easier than designing identity-based encryption schemes. In more detail, they show how an attribute-based encryption ...
    • Attribute-based versions of Schnorr and ElGamal 

      Herranz Sotoca, Javier (2016-01)
      Article
      Open Access
      We design in this paper the first attribute-based cryptosystems that work in the classical discrete logarithm, pairing-free, setting. The attribute-based signature scheme can be seen as an extension of Schnorr signatures, ...
    • CAL-A: Examen FQ: primavera 2019 

      Herranz Sotoca, Javier; Huemer, Clemens (Universitat Politècnica de Catalunya, 2019-06-07)
      Exam
      Restricted access to the UPC academic community
    • CAL-A: Examen MQ: primavera 2019 

      Herranz Sotoca, Javier (Universitat Politècnica de Catalunya, 2019-03-25)
      Exam
      Restricted access to the UPC academic community
    • Cifrado homomorfico de clave publica basado en Residuosidad Cuadratica 

      Herranz Sotoca, Javier; Sisternes, Juan Ramón (2012)
      Conference report
      Open Access
      Los esquemas de cifrado de clave p´ ublica con propiedades homom´orficas tienen muchas utilidades en aplicaciones reales. Entre los esquemas con propiedades homom´orficas aditivas existentes, hay una familia (desde el ...
    • Classifying data from protected statistical datasets 

      Herranz Sotoca, Javier; Matwin, Stan; Nin Guerrero, Jordi; Torra i Reventós, Vicenç (2010-06-09)
      Article
      Open Access
      Statistical Disclosure Control (SDC) is an active research area in the recent years. The goal is to transform an original dataset X into a protected one X0, such that X0 does not reveal any relation between confidential ...
    • CODES AND CRYPTOGRAPHY 

      Herranz Sotoca, Javier (Universitat Politècnica de Catalunya, 2016-01-08)
      Exam
      Restricted access to the UPC academic community
    • CODES AND CRYPTOGRAPHY 

      Herranz Sotoca, Javier (Universitat Politècnica de Catalunya, 2016-12-22)
      Exam
      Restricted access to the UPC academic community
    • CODES AND CRYPTOGRAPHY 

      Herranz Sotoca, Javier (Universitat Politècnica de Catalunya, 2016-11-02)
      Exam
      Restricted access to the UPC academic community
    • CODES AND CRYPTOGRAPHY 

      Herranz Sotoca, Javier (Universitat Politècnica de Catalunya, 2015-01-09)
      Exam
      Restricted access to the UPC academic community
    • Constant size ciphertexts in threshold attribute-based encryption 

      Herranz Sotoca, Javier; Laguillaumie, Fabien; Ràfols Salvador, Carla (Springer Verlag, 2010)
      Conference report
      Open Access
      Attribute-based cryptography has emerged in the last years as a promising primitive for digital security. For instance, it provides good solutions to the problem of anonymous access control. In a ciphertextpolicy attribute-based ...
    • Distributed privacy-preserving methods for statistical disclosure control 

      Herranz Sotoca, Javier; Nin Guerrero, Jordi; Torra i Reventós, Vicenç (2010)
      Article
      Restricted access - publisher's policy
      Statistical disclosure control (SDC) methods aim to protect privacy of the confidential information included in some databases, for example by perturbing the non-confidential parts of the original databases. Such methods ...
    • Efficient cryptosystems from 2k-th power residue symbols 

      Herranz Sotoca, Javier; Libert, Benoit; Joye, Marc; Benhamouda, Fabrice (2017-04)
      Article
      Open Access
      Goldwasser and Micali (J Comput Syst Sci 28(2):270–299, 1984) highlighted the importance of randomizing the plaintext for public-key encryption and introduced the notion of semantic security. They also realized a cryptosystem ...
    • Examen final 

      Herranz Sotoca, Javier; Boza Rocho, Santiago; Olm Miras, Josep Maria; Alonso Alonso, María Teresa (Universitat Politècnica de Catalunya, 2019-01-22)
      Exam
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    • Examen final 

      Herranz Sotoca, Javier; Boza Rocho, Santiago; Olm Miras, Josep Maria; Alonso Alonso, María Teresa (Universitat Politècnica de Catalunya, 2018-06-06)
      Exam
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    • Examen MQ 

      Herranz Sotoca, Javier; Boza Rocho, Santiago; Olm Miras, Josep Maria; Alonso Alonso, María Teresa (Universitat Politècnica de Catalunya, 2018-10-29)
      Exam
      Restricted access to the UPC academic community
    • Examen MQ 

      Herranz Sotoca, Javier; Boza Rocho, Santiago; Olm Miras, Josep Maria; Alonso Alonso, María Teresa (Universitat Politècnica de Catalunya, 2018-04-06)
      Exam
      Restricted access to the UPC academic community