A survey of the state-of-the-art approaches for evaluating trust in software ecosystems

Third-party software has streamlined the software engineering process, allowed software engineers to focus on developing more advanced components, and reduced time and cost. This shift has led to software development strategies moving from competition to collaboration, resulting in the concept of software ecosystems, in which internal and external actors work together on shared platforms and place their trust in the ecosystem. However, the increase in shared components has also created challenges, especially in security, as the large dependency trees significantly enlarge a system's attack surface. The situation is made worse by the lack of effective ways to measure and ensure the trustworthiness of these components. In this article, we explore current approaches used to evaluate trust in software ecosystems, focusing on analyzing the specific techniques utilized, the primary factors in trust evaluation, the diverse formats for result presentation, as well as the software ecosystem entities considered in the approaches. Our goal is to provide the status of current trust evaluation approaches, including their limitations. We identify key challenges, including the limited coverage of software ecosystem entities; the objectivity, universality, and environmental impacts of the evaluation approaches; the risk assessment for the evaluation approaches; and the security attacks posed by trust evaluation in these approaches.