<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Stoupa, Konstantina</style></author><author><style face="normal" font="default" size="100%">Athena Vakali</style></author><author><style face="normal" font="default" size="100%">Li, Fang</style></author><author><style face="normal" font="default" size="100%">Tsoukalas, Ioannis</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">Lindner, Wolfgang</style></author><author><style face="normal" font="default" size="100%">Mesiti, Marco</style></author><author><style face="normal" font="default" size="100%">Türker, Can</style></author><author><style face="normal" font="default" size="100%">Tzitzikas, Yannis</style></author><author><style face="normal" font="default" size="100%">Athena Vakali</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">XML-Based Revocation and Delegation in a Distributed Environment</style></title><secondary-title><style face="normal" font="default" size="100%">EDBT Workshops</style></secondary-title><tertiary-title><style face="normal" font="default" size="100%">Lecture Notes in Computer Science</style></tertiary-title></titles><dates><year><style  face="normal" font="default" size="100%">2004</style></year></dates><publisher><style face="normal" font="default" size="100%">Springer</style></publisher><volume><style face="normal" font="default" size="100%">3268</style></volume><pages><style face="normal" font="default" size="100%">299-308</style></pages><isbn><style face="normal" font="default" size="100%">3-540-23305-9</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The rapid increase on the circulation of data over the web has highlightedthe need for distributed storage of Internet-accessible information due tothe rapid increase on the circulation of data over the web. Thus, access controlmechanisms should also be distributed in order to protect them effectively. A recentidea in the access control theory is the delegation and revocation of rights,i.e. the passing over of one clients rights to the other and vice versa. Here, wepropose an XML-based distributed delegation module which can be integratedinto a distributed role-based access control mechanism protecting networks. Theidea of X.509v3 certificates is used for the transfer of authorization informationreferring to a client. The modules are XML-based and all of the associated datastructures are expressed through Document Type Definitions (DTDs).&lt;/p&gt;
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