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V. Benjumea, J. Lopez, and J. M. Troya, "Anonymity Analysis in Credentials-based Systems: A Formal Framework",
Computer Standards & Interfaces, vol. 30, no. 4, Elsevier, pp. 253-261, 2008. (I.F.: 1.074)More..


  Anonymity has been formalized and some metrics have been defined in the scope of anonymizing communication channels. In this paper, such formalization has been extended to cope with anonymity in those scenarios where users must anonymously prove that they own certain privileges to perform remote transactions. In these types of scenarios, the authorization policy states the privileges required to perform a given remote transaction. The paper presents a framework to analyze the actual degree of anonymity reached in a given transaction and allows its comparison with an ideal anonymity degree as defined by the authorization policy, providinga tool to model, design and analyze anonymous systems in different scenarios.    

Impact Factor: 1.074
Journal Citation Reports® Science Edition (Thomson Reuters, 2008)

PDF icon VicenteBenjumea2008.pdf (248.09 KB)
V. Benjumea, J. Lopez, and J. M. Troya, "Specification of a Framework for the Anonymous Use of Privileges",
Telematics and Informatics, vol. 23, no. 3, Elsevier, pp. 179-195, 2006. More..


In this paper we have defined an open framework to support open distributed applications where anonymous transactions based on user privileges play an important role. The goal of the framework is to provide a basis to the application level, and is presented from an open and general perspective where many different implementation schemes can fit. Moreover, we have presented a set of requirements that implementation schemes must fulfill to conform a fully anonymous privilege system, which guarantees to supported applications that anonymity will be preserved in remote transactions. Finally, we present an application scenario using the services provided by the framework in order to better show the possibilities of what this type of systems offers.

PDF icon VicenteBenjumea2006.pdf (174.49 KB)
V. Benjumea, J. Lopez, and J. M. Troya, "Anonymous Attribute Certificates based on Traceable Signatures",
Internet Research, vol. 16, no. 2, Elsevier, pp. 120-139, 2006. (I.F.: 0.607)More..


  In Benjumea et. al (Benjumea, 2004) we introduced the concept of anonymousattribute certificates in order to integrate anonymity capabilities in the standardizedX.509 attribute certificates. That solution was based on the use of fair-blind signatures(Stadler, 1995), but did not explore further possibilities of constructing similar datastructures based on more advanced signature schemes. In this new work, we propose anew type of anonymous attribute certificates that is based on the more recently proposedtraceable signature scheme (Kiayias, 2004a), providing a new anonymous authorizationsolution with interesting features that were not covered in the aforementioned scheme.Thus, this new solution allows users to make use of their attribute certificates in ananonymous way, but under certain circumstances it allows to disclose the users’ identities,trace the transactions carried out by any specific user, or revoke any anonymousattribute certificate. An additional contribution of this work is that it pays special attentionto the preservation of the unlinkability property between transactions, makingimpossible the creation of anonymous user profiles.

Impact Factor: 0.607
Journal Citation Reports® Science Edition (Thomson Reuters, 2006)

PDF icon VicenteBenjumea2006a.pdf (320.1 KB)