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Mainly justified by the growing concern about vulnerabilities of IT systems, some new technologies are being integrated into computing devices, for realizing so-called Trusted Computing systems. However, they are raising questions about intrusive cyber-control over individual user activities and data, but also about consequences in cyber-war scenarios. The aim of this article is to confront Trusted Computing systems with distributed Trust Management systems, which realize access control for local resources on the basis of delegation of access rights, according to local trust decisions. Both technologies are discussed from various points of view: architecture, vision, ethics, politics and law. Some experimentations are also presented, to show the applicability of Trust Management techniques to modern Service-Oriented Architectures.

Concern about vulnerabilities of IT systems is growing together with attention to risks of intrusive cyber-control over personal activities and data. This article discusses some new technologies that are being integrated into computing devices for realizing so-called Trusted Computing and Digital Rights Management systems, which can remotely attest their current hardware/software state and can enforce external policies to access protected content. These technologies are then confronted with distributed Trust Management systems, which realize access control for local resources on the basis of delegation of access rights according to local trust decisions. Both technologies are discussed from various points of view: architecture, vision, ethics, politics and law.

Current approaches to build social networking systems are based on a centralized architecture because it allows a simple browser-based user experience and makes easier and more efficient to implement many algorithms used in a social networking site (e.g., friend suggestion), However this kind of architecture has many drawbacks for its users, e.g., lack of privacy, lack of anonymity, risks of censorship and operating costs. This paper presents a system, called Blogracy, which uses widespread and stable peer-to-peer technologies, such as distributed hash tables and BitTorrent, for coping with intrinsic defects of centralized architectures and for being the basis of solid distributed social networking platforms. Moreover, Blogracy takes advantages of multi-agent systems for simplifying the implementation of social network services in a decentralized setting.