J L Villar (Jorge Luis Villar) - Homepage

List of Publications

Recent publications:

S. Platikanov, A. Palomas, M. Cedeño, R. Tauler, J.L. Villar, R. Bragós, S. Bermejo, J. Jaumot and S. Lacorte. Coupling electrochemical and spectroscopic methods for river water dissolved organic matter characterization. Environmental Monitoring and Assessment 197 (2025) 1071. DOI: 10.1007/s10661-025-14489-2

Publications in cryptology:

A. Escala, G. Herold, E. Kiltz, C. Ràfols and J.L. Villar. An Algebraic Framework for Diffie-Hellman Assumptions. Journal of Cryptology 30(1) (2017) 242-288. DOI: 10.1007/s00145-015-9220-6
J.L. Villar. Equivalences and Black-Box Separations of Matrix Diffie-Hellman Problems. Public Key Cryptography (PKC 2017), Lecture Notes in Computer Science 10174 (2017) 435-464. Amsterdam, Netherlands, March 2017. DOI: 10.1007/978-3-662-54365-8_18
P. Morillo, C. Ràfols and J.L. Villar. The Kernel Matrix Diffie-Hellman Assumption. Asiacrypt 2016, Lecture Notes in Computer Science 10031 (2016) 729-758. Hanoi, Vietnam, December 2016. DOI: 10.1007/978-3-662-53887-6_27
M.I. González-Vasco, A.L. Pérez del Pozo, P. Taborda and J.L. Villar. Cryptanalysis of a key exchange scheme based on block matrices. Information Sciences 276 (2014) 319-331. DOI: 10.1016/j.ins.2013.11.009
A. Escala, G. Herold, E. Kiltz, C. Ràfols and J.L. Villar. An Algebraic Framework for Diffie-Hellman Assumptions. Crypto 2013, Lecture Notes in Computer Science 8043 (2013) 129-147. Santa Barbara, USA, August 2013. DOI: 10.1007/978-3-642-40084-1_8
J.L. Villar. Optimal Reductions of Some Decisional Problems to the Rank Problem. Asiacrypt 2012, Lecture Notes in Computer Science 7658 (2012) 80-97. Beijing, China, December 2012. DOI: 10.1007/978-3-642-34961-4_7
D. Galindo, J. Herranz and J.L. Villar. Identity-Based Encryption with Master Key-Dependent Message Security and Leakage Resilience. ESORICS 2012, Lecture Notes in Computer Science 7459 (2012) 627-642. Pisa, Italy, September 2012. DOI: 10.1007/978-3-642-33167-1_36
S. Heidarvand and J.L. Villar. A Fair and Abuse-Free Contract Signing Protocol from Boneh-Boyen Signature. EuroPKI 2010, Lecture Notes in Computer Science 6711 (2011) 125-140. Athens, Greece, September 2010. DOI: 10.1007/978-3-642-22633-5
M.I. González-Vasco, S. Heidarvand and J.L Villar. Anonymous Subscription Schemes - A Flexible Construction for On-line Services Access. Proc. of the International Conference on Security and Cryptography (SECRYPT 2010), (2010) 120-131. Athens, Greece, July 2010.
S. Heidarvand and J.L. Villar. Public Verifiability from Pairings in Secret Sharing Schemes. SAC 2008, Lecture Notes in Computer Science 5381 (2009) 294-308. Sackville NB, Canada, August 2008. DOI: 10.1007/978-3-642-04159-4
T. Tassa and J.L. Villar. On proper secrets, $(t,k)$-bases and linear codes. Designs, Codes and Cryptography 52(2) (2009) 129-154. DOI: 10.1007/s10623-009-9272-4
M.I. González and J.L. Villar. In search of mathematical primitives for deriving universal projective hash families. Applicable Algebra in Engineering, Communication and Computing 19(2) (2008) 161-173. DOI: 10.1007/s00200-008-0068-y
M.I. González, R. Steinwandt and J.L. Villar. Towards Provable Security for Cryptographic Constructions Arising from Combinatorial Group Theory. Algebraic Methods in Cryptography. Contemporary Mathematics 418 (2006) 89-102. DOI: 10.1090/CONM/418/07948
P. Paillier and J.L. Villar. Trading One-Wayness against Chosen-Ciphertext Security in Factoring-Based Encryption. Asiacrypt 2006, Lecture Notes in Computer Science 4284 (2006) 252-266. Shangai, China, December 2006. DOI: 10.1007/11935230_17
A. Ruiz and J.L. Villar. Publicly Verifiable Secret Sharing from Paillier's Cryptosystem. Lecture Notes in Informatics P-74 (2005) 98-108.
D. Galindo, S. Martín, P. Morillo and J.L. Villar. Fujisaki-Okamoto hybrid encryption revisited. International Journal of Information Security 4(4) (2005) 228-241. DOI: 10.1007/s10207-004-0042-z
M.I. González-Vasco, C. Martínez, R. Steinwandt and J.L. Villar. A New Cramer-Shoup Like Methodology for Group Based Provably Secure Encryption Schemes. Theory of Cryptography Conference (TCC 2005), Lecture Notes in Computer Science 3378 (2005) 495-509. Cambridge MA, USA, February 2005. DOI: 10.1007/b106171
D. Galindo, S. Martín, T. Takagi and J.L. Villar. A Provably Secure Elliptic Curve Scheme with Fast Encryption. Progress in Cryptology (INDOCRYPT '04), Lecture Notes in Computer Science 3348 (2004) 245-259. Chennai, India, December 2004. DOI: 10.1007/b104579
J. Herranz and J.L. Villar. An unbalanced protocol for group key exchange. Trust and Privacy in Digital Business (TrustBus '04), Lecture Notes in Computer Science 3184 (2004) 172-180. Zaragoza, Spain, August 2004. DOI: 10.1007/b99832
D. Galindo, S. Martín, P. Morillo and J.L. Villar. Easy Verifiable Primitives and Practical Public Key Cryptosystems. Information Security Conference (ISC '03), Lecture Notes in Computer Science 2851 (2003) 69-83. Bristol, United Kingdom, October 2003. DOI: 10.1007/10958513_6
D. Galindo, S. Martín, P. Morillo and J.L. Villar. An IND-CPA cryptosystem from Demytko's primitive. Proc. of the IEEE Information Theory Workshop (ITW '03), 167-170. Paris, France, April 2003. DOI: 10.1109/ITW.2003.1216721
D. Galindo, S. Martín, P. Morillo and J.L. Villar. An efficient semantically secure elliptic curve cryptosystem based on KMOV. Proc. of the International Workshop on Coding and Cryptography (WCC '03), 213-221. Versailles, France, March 2003.
D. Galindo, S. Martín, P. Morillo and J.L. Villar. A Practical Public Key Cryptosystem from Paillier and Rabin Schemes. Public Key Cryptography (PKC '03), Lecture Notes in Computer Science 2567 (2002) 279-291. Miami, USA, January 2003.
M. Valls and J.L. Villar. Distributed virtual safe-deposit box. IEICE Trans. Information and Systems E85-D 4 (2002) 786-788.
S. Martín, P. Morillo and J.L. Villar. Computing the order of points on an elliptic curve modulo N is as difficult as factoring N. Applied Mathematics Letters 14 (2001) 341-346. DOI: 10.1016/S0893-9659(00)00159-2
P. Morillo, C. Padró, G. Sáez and J.L. Villar. Weighted threshold secret sharing schemes. Information Processing Letters 70 (1999) 211-216. DOI: 10.1016/S0020-0190(99)00070-8
C. Padró, G. Sáez and J.L. Villar. Detection of cheaters in vector space secret sharing schemes. Designs, Codes and Cryptography 16 (1999) 75-85. DOI: 10.1023/A:1008378426278
A. Daniel, V. Torres and J.L. Villar. Parallelizing the RSA operator. Proc. of the 1st International Conference on the Theory and Applications of Cryptology (PRAGACRYPT '96), 67-75. Praga, Czech Republic, September 1996.

Preprints

J.L. Villar. Equivalences and Black-Box Separations of Matrix Diffie-Hellman Problems. Cryptology ePrint Archive, Report 2017/001 [2 Jan 2017].
P. Morillo, C. Ràfols and J.L. Villar. Matrix Computational Assumptions in Multilinear Groups. Cryptology ePrint Archive, Report 2015/353 [20 Apr 2015].
A. Escala, G. Herold, E. Kiltz, C. Ràfols and J.L. Villar. An Algebraic Framework for Diffie-Hellman Assumptions. Cryptology ePrint Archive, Report 2013/377 [11 Jun 2013].
D. Galindo, J. Herranz and J.L. Villar. Identity-Based Encryption with Master Key-Dependent Message Security and Applications. Cryptology ePrint Archive, Report 2012/142 [16 Mar 2012].
D. Galindo, S. Martín, P. Morillo and J.L. Villar. Fujisaki-Okamoto IND-CCA hybrid encryption revisited. Cryptology ePrint Archive, Report 2003/107 [28 May 2003].
D. Galindo, S. Martín, P. Morillo and J.L. Villar. A semantically secure elliptic curve RSA scheme with small expansion factor. Cryptology ePrint Archive, Report 2002/083 [27 Jun 2002].
D. Galindo, S. Martín, P. Morillo and J.L. Villar. An efficient semantically secure elliptic curve cryptosystem based on KMOV. Cryptology ePrint Archive, Report 2002/037 [27 Nov 2002].

Publications in graph theory:

J.L. Villar. The underlying graph of a line digraph. Discrete Applied Mathematics 37/38 (1992) 525-538. DOI: 10.1016/0166-218X(92)90156-5
A.S. Lladó, J.L. Villar and M.A. Fiol. A new family of digraphs on alphabets. Proc. of the International Conference on Incidence Geometries and Combinatorial Structures (COMBINATORICS '88), 2 (1991) 181-193. Ravello, Italy, May 1988.
J.L. Villar. Kautz s-ary closed sequences. Proc. of the International Conference on Incidence Geometries and Combinatorial Structures (COMBINATORICS '88), 2 (1991) 459-469. Ravello, Italy, May 1988.
M.A. Fiol, A.S. Lladó and J.L. Villar. Digraphs on alphabets and the (d,N) digraph problem. Ars Combinatoria 25C (1988) 105-122.

Other publications:

A. Albareda, R. Pérez, J.L. Villar, E. Minguella and J.A. Gorri. Intermodulation measurement of nonlinearities in piezoceramic resonators. Review of Scientific Instruments 68(8) (1997) 3143-3149. DOI: 10.1063/1.1148259
R. Pérez, A. Albareda, E. Minguella and J.L. Villar. Electrical model for a nonlinear piezoelectric transducer. Proc. of the 10th IEEE Int. Symp. on Appl. of Ferroelectrics (ISAF '96), 2 (1996) 955-958. East Brunswick, USA, August 1996. DOI: 10.1109/ISAF.1996.598185
R. Pérez, L. Benadero, A. Albareda, M. Tresánchez, J.A. Gorri and J.L. Villar. Low signal analysis of piezoelectric transformers. Ferroelectrics 134 (1992) 99-104. DOI: 10.1080/00150199208015572
L. Benadero, J.L. Villar, J.A. Gorri, A. Albareda, E. Toribio and R. Pérez. Measuring magnetic dipole fields using Hall effect sensors. European Journal of Physics 12(3) (1991) 146-148. DOI: 10.1088/0143-0807/12/3/009
N. Ferrer Anglada, J. Fontcuberta, J.L. Villar and A. Albareda. Transport properties of YBa₂Cu_3-xFe_xO₇ superconducting oxides. Ferroelectrics 105 (1990) 69-74. DOI: 10.1080/00150199008224620