A Hierarchy Relation Model of Software System Trustworthiness Representation

The representation of Software trustworthiness is the basis of modeling, specification and analysis, which directly affects the validity of the trustworthiness evaluation in the work environment. In this paper, after distinguishing and analyzing the concepts which are similar to the trustworthiness and the attributes which are included by trustworthiness, trustworthy attribute is divided into atomic trustworthy attribute and compositive trustworthy attribute from the perspective of independence and interaction. The concepts of requisite trustworthy attribute and important trustworthy attribute are put forward from the perspective of requirement analysis. Based on the hierarchy and interrelation between trustworthy attributes, a hierarchy relation model which can express the software trustworthiness is put forward, and trustworthiness is broke down into basic trustworthiness and application trustworthiness in the model. The hierarchy relation model can guide the acquisition, expression and analysis of software trustworthy requirements. Adopting embedded software for trouble monitoring of aeronautical engine as the example, the paper explains the application of models.