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The pervasive environment implies a massive increase in the scale of systems, the heterogeneity of devices and diversity in services available, making the complex task of centrally managing the environment unfeasible. The scope and role of trusted third parties in facilitating trust is also reduced because of the high number of bilateral trust relationships, which cannot be predefined and managed statically. Moreover, the dynamic, mobile and asynchronous nature of many of the devices means thatdoi:10.1023/b:bttj.0000047124.46203.fc fatcat:wkaaanwhynhnbomwg6n6mwoaw4