Formalization of Signaling System by Process Calculus

Software systems play an important role in social infrastructures, and in the public and private sectors, for example in core banking, enterprise resource planning systems, electronic medical record systems, telephone exchange systems, etc. In such fundamental systems, we desire not only correctness but also robustness. Formal methods, such as software verification, have focused on correctness rather than robustness. The Spice calculus, which was proposed by Nishizaki et al., is a calculus process which enables us to formalize and analyze the resistance of communication protocols against Denial-of-Service attacks. The key idea of the analysis is analyzing costs of initiators and responders in communication protocols. In this paper, we extend the target area of systems to be analyzed by the Spice calculus and describe a new analysis methodology for distributed systems. We demonstrate analysis of a telephone exchange system, as an example of our methodology. In this paper, we extend the target area of systems to be analyzed by the Spice calculus and show a new analysis methodology for distributed systems. We demonstrate analysis of a telephone exchange system, as an example of our methodology. We set up ISUP of Signaling System No. 7 as a target and formalized a simple telephone network based on it in the framework of the Spice calculus. We then analyzed its connection establishing process and computation cost consumed the connection establishment.