Evaluation of Assurance Case Description Method using ISO 27001 for Merger and Acquisition
This study proposes an assurance case description method based on the framework of In-formation Security Management System (ISMS; ISO 27001). The method agrees to information security policies through co-creation of values between a parent company and its merged and acquired subsidiary. Information security policy varies among companies. Parent companies need to agree with their merged or acquired companies on the information security policies. The purpose is to maintain the existing business of the subsidiaries while the parent companies continue to use the current IT infrastructure and network.
This study first structuralizes ISO 27001 by using an assurance case. As a result, this study will: 1) Clarify the range of agreement and disagreement between the two companies’ information security policies; and 2) show how two companies mutually conclude a final agreement for the entire range using the assurance case created. We also present the quantitatively evaluated results from Goal Structuring Notation (GSN) users’ ability to structuralize systems with multiple viewpoints by using GSN. This evaluates the proposed description method. We asked three experts in information security to evaluate the understanding, utility and effectiveness of the proposed assurance case description method. The study participants used the method to create an assurance case.
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