Trust Assessment for the Security of Information Systems.

Recent development of various sensors and communicating devices has significantly enhanced information systems (IS). However, the security of these objects as well as the confidence in the information they produce cannot be guaranteed. They can be deceived or under the control of a malicious third party. This raises new issues concerning trust one can have in data, sensors, and the IS itself. This research studies security of information systems considering trust assessment. This paper first introduces the concept of trust one can have in the sources of information and then defines a mathematical trust-measure. A thought on global trust measurement and propagation of trust is presented in the Discussion section, but it is not dealt with in this paper. Simulations conducted in the framework of ship navigation system illustrate the relevance of this approach.