Javier Herranz

Lecturer at UPC
Research area: Discrete Mathematics

PhD in Mathematics obtained at UPC (2005)


Javier Herranz obtainedhisPh.D. in AppliedMathematics in 2005, in theTechnicalUniversity of Catalonia (UPC, Barcelona, Spain). After that, he spent 9 months in theEcolePolytechnique (France), 9 months in theCentrumvoorWiskunde en Informatica (CWI, TheNetherlands) and 2 years in IIIA-CSIC (Bellaterra, Spain), as a post-doctoral researcher (ERCIM and Juan de la Cierva fellowships). From 2009, he belongstotheresearchgroup MAK (Dept. AppliedMathematics IV, UPC), first as a Ramón y Cajal post-doctoral researcher, and currently as a seniorlecturer. Hisresultsoncryptography and privacy of statisticaldatasetshavebeenpublished in well-knownjournals and conferences.

Research lines

  • Cryptographic protocols
  • Provable security
  • Distributed cryptography
  • Secret sharing schemes
  • Attribute-based cryptography

Selected publications

  • J. Herranz and G. Sáez. “Forking lemmas for ring signature schemes”. Proceedings of Indocrypt’03, Lecture Notes in Computer Science, Vol. 2904, pp. 266-279, 2003
  • D. Galindo, J. Herranz and E. Kiltz.“On the generic construction of identity-based signatures with additional properties”.Proceedings of Asiacrypt’06, Lecture Notes in Computer Science, Vol. 4284, pp. 178-193, 2006
  • J. Herranz, F. Laguillaumie and C. Ràfols.“Constant size ciphertexts in threshold attribute-based encryption”.Proceedings of PKC’10, Lecture Notes in Computer Science, Vol. 6056, pp. 19-34, 2010
  • C. Aguilar, P. Gaborit and J. Herranz.“Additively homomorphic encryption with d-operand multiplications”.Proceedings of CRYPTO’10, Lecture Notes in Computer Science, Vol. 6223, pp. 138-154, 2010
  • J. Herranz, A. Ruiz and G. Sáez.“New results and applications for multi-secret sharing schemes”.Designs, Codes and Cryptography, Volume 73, Issue 3, pp. 841-864, 2014