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A group is defined as a collection of entities with particular affinities and capabilities. All entities may have a trust and a reputation value of each other in the system. In many cases it may be necessary to trust the whole system instead of one particular entity. In such cases group trust represents the trust of their particular members. To achieve this, this paper presents a group trust calculation model. We implemented the proposed model in a P2P simulation tool and presented main results for group trust calculation. <\/jats:p>","DOI":"10.1155\/2014\/872842","type":"journal-article","created":{"date-parts":[[2014,2,10]],"date-time":"2014-02-10T21:02:24Z","timestamp":1392066144000},"page":"872842","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["GTrust: Group Extension for Trust Models in Distributed Systems"],"prefix":"10.1177","volume":"10","author":[{"given":"Robson","family":"de Oliveira Albuquerque","sequence":"first","affiliation":[{"name":"Group of Analysis, Security and Systems (GASS), Department of Software Engineering and Artificial Intelligence (DISIA), School of Computer Science, Office 431, Universidad Complutense de Madrid (UCM), Calle Profesor Jos\u00e9 Garc\u00eda Santesmases s\/n, Ciudad Universitaria, 28040 Madrid, Spain"},{"name":"Electrical Engineering Department, University of Brasilia, Campus Universit\u00e1rio Darcy Ribeiro, Asa Norte, 70910-900 Brasilia, DF, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luis Javier Garc\u00eda","family":"Villalba","sequence":"additional","affiliation":[{"name":"Group of Analysis, Security and Systems (GASS), Department of Software Engineering and Artificial Intelligence (DISIA), School of Computer Science, Office 431, Universidad Complutense de Madrid (UCM), Calle Profesor Jos\u00e9 Garc\u00eda Santesmases s\/n, Ciudad Universitaria, 28040 Madrid, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tai-Hoon","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Convergence Security, Sungshin Women's University, 249-1 Dongseon-dong 3-ga, Seoul 136-742, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2014,2,10]]},"reference":[{"first-page":"1","volume-title":"Proceedings of the 5th International Conference on Cyber Conflict (CyCon '13)","author":"Covington M. 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