TSF Group

Special tribute to Jean-Claude Laprie

The work of the group focuses on dependability of computing systems, i.e., the ability to deliver a service that can be justifiably trusted. It encompasses the properties of availability, reliability, integrity, confidentiality, maintainability, safety, as well as security.

Research topics

Mobility Evolvability
and autonomy
Openness Reactivity
(Fault prevention
and Fault tolerance)


Mobility-explicit computing models
Self-organizing fault-tolerant nanochips  
On-line adaptation of fault tolerance software

Defenses for autonomously-adapting systems  
Privacy protection

Operating system kernel protection

Virtualization and diversification

Protection of critical infrastructures

Service oriented applications
Early error detection for real time applications

Future flight control systems

Robustness of automotive embedded systems
Analysis (Fault removal and Fault forecasting) Dependability evaluation in a mobile context

Testing in mobile settings
Risk analysis for autonomously-adapting systems

Testing of autonomous
system software
Characterization of attacks

of intrusion detection systems

Security measures

Modeling interdependencies
of critical infrastructures
Testing and formal verification of behavioral models

Dependability benchmarking

Modeling the dependability of critical systems

The computing systems of interest to us are the future large, networked, evolving systems constituting complex information infrastructures interconnecting servers, mobile computers, embedded devices, etc. The major issue at stake in such ubiquitous systems is how to maintain their dependability. The changes to which ubiquitous systems are subjected can be functional, technological, or environmental, and may include or induce new threats.

In this context, our research is best situated in the context of resilience, i.e., the persistence of dependability when facing changes.

From the resilience point of view, ubiquitous systems are facing four challenges: mobility, evolvability and autonomy, openness, reactivity. We are addressing these challenges from two complementary, and closely related, viewpoints:

  • Architecture: design approaches, policies, algorithms, and mechanisms, for fault prevention and fault tolerance.

  • Analysis: verification for fault removal and evaluation for fault forecasting.

An overview of our research topics, structured according to the four challenges, and to the architecture and analysis viewpoints is given in the research topics table.

A strong characteristic of our research relates to the scope of the faults taken into account: hardware physical faults, software faults and malicious interaction faults, i.e., intrusions. Moreover, for many years the group has conducted both conceptual and experimental work. As a consequence, the group benefits from a prominent position within the dependable computing community.