Definition of Evaluation Assurance Levels and Estimation of Evaluation Efforts for Operational System Based ISO/IEC 19791

ISO/IEC 19791 that is evaluation scheme of information security operational system, is not defined evaluation-assurance-level (i.e., EAL) like ISO/IEC 15408 (i.e., Common Criteria, CC) that is evaluation scheme of information security product. In this paper, ISO/IEC 19791 that is evaluation and certification on operational system defined EAL, from ELA 1 up to EAL 7. And ISO/IEC 19791 calculated relative rate of evaluation effort of each EAL.