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J. Lopez, A. Mana, J. A. Montenegro, and J. J. Ortega, "PKI Design Based on the Use of On-line Certification Authorities",
International Journal of Information Security (IJIS), vol. 2, no. 2, Springer, pp. 91-102, 2004. More..


Public-Key Infrastructures (PKIs) are considered the basis of the protocols and tools needed to guarantee the security demanded for new Internet applications like electronic commerce, government-citizen relationships and digital distribution. This paper introduces a new infrastructure design, Cert’eM, a key management and certification system that is based on the structure of the electronic mail service and on the principle of near-certification. Cert’eM provides secure means to identify users and distribute their public-key certificates, enhances the efficiency of revocation procedures, and avoids scalability and synchronization problems. Because we have considered the revocation problem as priority in the design process, and with a big influence in the rest of the PKI components, we have developed an alternative solution to the use of Certificate Revocation Lists (CRLs), which has become one of the strongest points in this new scheme.

PDF icon JavierLopez2004b.pdf (283.07 KB)
J. Lopez, A. Mana, J. J. Ortega, and E. Pimentel, "Protección de Software basada en Tarjetas Inteligentes",
VII Reunión Española sobre Criptología y Seguridad de la Información (VII RECSI), pp. 485-497, Septiembre, 2002.
J. Lopez, J. J. Ortega, and J. M. Troya, "Protocol Engineering Applied to Formal Analysis of Security Systems",
International Conference on Infrastructure Security (InfraSec’02), LNCS 2437, Springer-Verlag, pp. 246-259, October, 2002. More..


Every communication system requiring security properties is certainly critical. In order to study the security of communication systems, we have developed a methodology for the application of the formal analysis techniques of communication protocols to the analysis of cryptographic ones. We have extended the design and analysis phases with security properties. Our methodology uses a specification technique based on the HMSC/MSC requirement languages, and translates it into a generic schema for the SDL specification language, which is used for the analysis. Thus, the technique allows the specification of security protocols using a standard formal language and uses Object-Orientation for reusability purposes. The final goal is not only the formal specification of a security system, but to examine the possible attacks, and later use the specification in more complex systems.

PDF icon JavierLopez2002b.pdf (134.19 KB)
J. Lopez, A. Mana, and J. J. Ortega, "A Public Key Infrastructure for User Identification",
IFIP Working Conference on User Identification and Privacy Protection, pp. 209-227, June, 1999. More..


While there is wide agreement on the immense potential of Internet, its growth and performance are adversely affected by security issues. Despite its impressive size, scope and reach, the Internet has not yet become a common vehicle for many of these new possibilities. Progress in fields as electronic commerce and government-citizen relationships have been limited by the open design of the network itself. Today, Public-Key Infrastructures are the basis of the protocols and tools needed to guarantee the security demanded in those fields. Trust management and user identification are also important issues that remain unresolved. This paper introduces a key management and user identification system, named Cert’eM, that is based on the electronic mail service. Cert’eM provides important advantages over existing Public-Key Infrastructures and user identification proposals.

PDF icon JavierLopez1999a.pdf (191.03 KB)
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