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J. Lopez, I. Agudo, and J. A. Montenegro, "On the deployment of a real scalable delegation service",
Information Security Technical Report, vol. 12, no. 3, Elsevier, pp. 139-147, Jun 2007. DOI More..


      This paper explains the evolution of the concept of delegation since its first references in the context of distributed authorization to the actual use as a fundamental part of a privilege management architecture. The work reviews some of the earliest contributions that pointed out the relevance of delegation when dealing with distributed authorization, in particular we comment on PolicyMaker and Keynote, and also on SDSI/SPKI. Then, we elaborate on Federation as a particular case of delegation, and remark the importance given to federation by the industry. Finally, the paper discusses about privilege management infrastructures, introducing a new mechanism to extend their functionality using advanced delegation services.

PDF icon JavierLopez2007.pdf (366.06 KB)
I. Agudo, J. Lopez, J. A. Montenegro, E. Okamoto, and E. Dawson, "Delegation Perspective of Practical Authorization Schemes",
Fifth International Network Conference (INC’05), pp. 157-164, 2005. More..
PDF icon IsaacAgudo2005a.pdf (64.72 KB)
J. A. Montenegro, J. Lopez, and F. Moya, "Diseño e Implementación del Marco de Trabajo de Certificado de Atributos X509 para la Delegación de Privilegios",
VIII Reunión Española sobre Criptología y Seguridad de la información (VIII RECSI),Madrid, pp. 571-581, Septiembre, 2004. More..


Este trabajo muestra los detalles de una implementacion prototipo del marco de trabajo de Certificados de Atributos X.509 (Xac), propuesto por la recomendacion ITU-T. La implementacion utiliza como base de la plataforma la librer

PDF icon JoseA.Montenegro2004.pdf (177.35 KB)
J. Lopez, J. A. Montenegro, R. Roman, and J. Davila, "Design of a VPN Software Solution Integrating TCP and UDP Services",
International Conference on Infrastructure Security (InfraSec’02), LNCS 2437, Springer-Verlag, pp. 325-337, October, 2002. More..


The main aims of Virtual Private Network (VPN) are to isolate a distributed network from outsiders, as well as to protect the confidentiality and integrity of sensitive information traversing a non-trusted network such as the Internet. However, some problems arise when security is considered as the unique problem because VPN users suffer from restrictions in their access to the network. They are not free to use traditional Internet services such as electronic mail exchange with non-VPN users, and to access Web and FTP servers external to the organization. This paper presents a new solution that allows the open use of traditional network services running over TCP and UDP layers, while maintaining strong security features. The new scheme works at the TCP/IP transport layer and does not require the addition of new hardware because it is a totally software solution. As a consequence, the application is totally portable. Moreover, and because of its implementation at the transport layer, there is no need to modify any traditional communication applications previously installed in the network system.

PDF icon JavierLopez2002c.pdf (126.07 KB)
J. Lopez, A. Mana, J. A. Montenegro, J. J. Ortega, and J. M. Troya, "Designing Software Tools for the Use of Secure Electronic Forms",
3rd ACIS Int. Conf. on Software Engineering, Artificial Intelligence Networking and Parallel/Distributed Computing (SNPD’02), pp. 157-163, Junio, 2002. More..


Interaction of organizations and their clients by using the Internet can produce meaningful benefits in the accessibility, efficiency and availability of documents, regardless of time and location. However, some types of problems hinder a higher degree of communication. This paper presents some of the results of a Research Project that focuses on the influence of typical open networks risks in electronic interactions and on the need of creating software tools to manage electronic versions of the paper-based forms, as this is the traditional way of interaction through the Web.

PDF icon JavierLopez2002f.pdf (257.49 KB)
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