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In this paper, we propose a method by which frontline engineers in system development fields can readily describe the structure of the security of systems. This method, based on the assumption of the use of standard encryption technologies and existing cryptographic protocols, reveals hidden security threats and vulnerabilities of systems. It extracts only security elements that constitute the trust relationship of system components, describing the relation between the elements, and analyzing the relation. This method provides a valuable assistance tool to build secure systems, because it works as an efficient communication paradigm between stakeholders of a system to help them in understanding the security of the system and confirming that their security requirements are fulfilled.