A joint trust and risk model for MSaaS mashups

Modeling and simulation as a service and its difference from software as a service is explained. The literature on trust and risk for cloud service mashups are surveyed. A joint trust and risk model is intro-duced for MSaaS federations. The model is based on historic data related not only security incidents but also performance records. Negative and positive performances are differentiated and the freshness of the historic data are taken into account in the model. A numerical analysis by using the model through Monte-Carlo simulation is also provided.