This In-depth Study on Security is based on the findings of Taiwan Network Information Center Stakeholder Survey 2019. The report investigates the security requirements of private enterprises in Taiwan to get a full picture of reporting requirements and set up a trust mechanism. The goal is not only to achieve effective security reporting, but also for TWCERT/CC to better perform its role in bridging the public and private sector, develop services for and initiate collaboration with key stakeholders, as well as strengthen the links on enterprise cyber-security.