“…Ship operational technology systems for a last two decades have been intensively developed by means of digitalization, integration and networking. The development resulted in complex and computerbased technology systems, and therefore there is urgent need for safeguarding shipping from cyber threats and vulnerabilities (Svilicic et al 2019, Tam et al 2019, Filic 2018, Kessler et al 2018, Polatid et al 2018, Hareide et al 2018, Shapiro et al, 2018, Svilicic et al 2018, Lee et al 2017, Hassani et al 2017, Burton 2016, Balduzzi et al 2014, Svilicic et al 2005. The International Maritime Organization (IMO) has recently published the Guidelines on high-level recommendations for maritime cyber risk management (IMO MSC-FAL.1/Circ.3 2017), and imposed to include cyber risk assessment in the implementation of the International Safety Management (ISM) Code safety management system on ships by 1st of January 2021 (IMO MSC.428(98) 2017).…”