Sokratis K. Katsikas Javier Lopez Günther Pernul Trust, Privacy and Security in E-Business: Requirements and Solutions. 548-558 2005 conf/pci/2005 Panhellenic Conference on Informatics http://dx.doi.org/10.1007/11573036_52 db/conf/pci/pci2005.html#KatsikasLP05