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J. A. Montenegro, M. J. Fischer, J. Lopez, and R. Peralta, "Secure sealed-bid online auctions using discreet cryptographic proofs",
Mathematical and Computer Modelling, vol. 57, Elsevier, pp. 2583–2595, Jun 2013. DOI (I.F.: 2.02)More..


This work describes the design and implementation of an auction system using secure multiparty computation techniques. Our aim is to produce a system that is practical under actual field constraints on computation, memory, and communication. The underlying protocol is privacy-preserving, that is, the winning bid is determined without information about the losing bids leaking to either the auctioneer or other bidders. Practical implementation of the protocol is feasible using circuit-based cryptographic proofs along with additively homomorphic bit commitment. Moreover, we propose the development of a Proof Certificatestandard. These certificates convey sufficient information to recreate the cryptographic proofs and verify them offline.

Impact Factor: 2.02
Journal Citation Reports® Science Edition (Thomson Reuters, 2013)

PDF icon MFLR13.pdf (606.16 KB)
J. Lopez, J. A. Montenegro, and R. Roman, "Service-Oriented Security Architecture for CII based on Sensor Networks",
2nd International Workshop on Security Privacy and Trust in Pervasive and Ubiquitous Computing (SecPerU’06), IEEE Press, pp. 1-6, June, 2006. More..


The extraordinary growth of the Information Society is originating a high dependency on ICT. This provokes that those strongly interrelated technological infrastructures, as well as the information systems that underpin them, become highly critical, since their disruption would lead to high economical, material and, sometimes, human loss. As a consequence, the protection of these Critical Information Infrastructures is becoming a major objective for governments and companies. In this paper, we give an overview of the main challenges and open research issues on Critical Information Infrastructure security, and introduce an on-going research project that, using wireless sensor networks as an underlying technology, is dealing with those problems. Our research project focuses on the development of protection, control, evaluation, maintenance and verification mechanisms, integrated into a secure service-oriented architecture.

PDF icon JavierLopez2006a.pdf (66.6 KB)
J. Lopez, J. A. Montenegro, J. L. Vivas, E. Okamoto, and E. Dawson, "Specification and Design of Advanced Authentication and Authorization Services",
Computer Standards & Interfaces, vol. 27, no. 5, Elsevier, pp. 467-478, Jun 2005. DOI (I.F.: 0.62)More..


A challenging task in security engineering concerns the specification and integration of security with other requirements at the top level of requirements engineering. Empirical studies show that it is common at the business process level that customers and end users are able to express their security needs. Among the security needs of Internet applications, authentication and authorization services are outstanding and, sometimes, privacy becomes a parallel requirement. In this paper, we introduce a methodology for the specification of security requirements and use a case study to apply our solution. We further detail the resulting system after extending it with an Authentication and Authorization Infrastructure.

Impact Factor: 0.62
Journal Citation Reports® Science Edition (Thomson Reuters, 2005)

PDF icon javierlopez2005c.pdf (210.49 KB)
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