Sheikh Mahbub Habib (TU Darmstadt, Germany)
Max Mühlhäuser (TU Darmstadt, Germany)

Date, Time and Location

Monday, March 11, 2013, 09:00--12:30
Room: t.b.a.

Tutorial slides for download.


Trust is a complex notion that has been studied in various fields such as sociology, psychology and even economics. It is a common phenomenon that determines our behaviour and actions in our everyday social life. Interestingly enough, trust also plays a major role in electronic service environments, e.g., e-marketplaces, cloud and mobile apps marketplaces, to support decision making when interacting with unknown entities. In such environments, trust is often interpreted as belief of a consumer that a service is expected to satisfy requirements according to the service level agreed with a service provider. This service level satisfaction of the consumer depends on the quality of the service, e.g., service response time, or security-specific capabilities of a service or may be both. Often security-specific capabilities are reasoned using traditional security mechanisms, e.g., availability of SSL connection or certificates. However, quality of a service in service environments is often reasoned by means of experiences from other consumers who have interacted with the service in the past or by means of expert assessments. From consumers' perspective, all these mechanisms support them to build trust on a particular service and its provider in a distributed service environments.

On the one hand, traditional security mechanisms are referred to as "hard trust" as they are validated using concrete security functions and often characterized by certainty. On the other hand, experience based approaches are referred to as "soft trust" as they are driven by social control mechanisms that are based on intangible information, e.g., past experiences or reputation. Both of these concepts have their individual strengths which has been re ected in various trust systems and models to solve real-world problems. Today, however, academia and industry are aiming for a holistic solution that complements hard with soft trust. The approaches that demonstrate the initial results regarding this solution has been shown practical and effective for building trust in distributed environments.

In this tutorial, we provide an overview of trust concepts along with their research directions and trends in the field of distributed service environments. The tutorial also gives an introduction to the formal and applied constructions of computational trust mechanisms. We conclude the tutorial with recent research results from the field of distributed service environments, e.g., cloud computing, mobile apps marketplaces.


  • Motivation: Trust concepts in practice
    • E-marketplaces
    • Service environments
    • Recommendation or review platforms
  • Introduction to Trust
    • Basic terminologies and definitions
    • Soft trust
    • Hard trust
  • Trust Formulation and Evaluation
    • Requirements
    • State-of-the-art: representational and computational models
  • Domains of Applications
    • Cloud computing
    • Mobile apps marketplaces

About the Presenters

Sheikh Mahbub Habib is a PhD Candidate at the Center for Advanced Security Research Darmstadt (CASED) and research assistant at the Telecooperation Lab (TK) of Technische Universität Darmstadt Germany. He is working on computational trust models and how those models can be adapted in trust management for complex distributed service environments (e.g., cloud computing). Earlier, he earned M.Sc. in Networks and Distributed Systems, specializing in security and distributed systems from Chalmers University of Technology Sweden. He was recently invited as a visiting researcher and offered "Visiting Scholar" position in INSS research group of Department of Computing in Macquarie University Sydney Australia. His current research interests includes trust and reputation models, logical reasoning of trust, trust management techniques, trust enhanced security techniques and their application in complex distributed systems.

Max Mühlhäuser is a full professor at the Technische Universität Darmstadt, Germany, where he heads the Telecooperation Lab (TK) and coordinates a division of the Center for Advanced Security Research Darmstadt (CASED). After his doctorate and a leading position in industrial research, he held permanent or visiting professorships in Kaiserslautern (D), Karlsruhe (D), Linz (A), Montréal, Sophia Antipolis (F), and San Diego. With his team, he covers a broad range of Ubiquitous Computing research topics in three complementary fields: 1) ubiquitous interaction issues such as interaction concepts for future devices, proactive, context aware, and multi device interaction; 2) issues of large scale networks (OSN, P2P, WSN) and smart spaces such as middleware, context and location awareness, discovery and composition, and knowledge work; 3) ubiquitous privacy and trust, and resilience for critical infrastructures.