Tier: A level where an organization manages risks.This consists of five functions, 23 categories, and 108 subcategories. Its document consists of three parts: Core, Tier, and Profile. The NIST CSF focuses on considering cyber-security risks as part of the risk management process of an organization. In the IT security world, it has been used in many cases as a standard. It has been published for free, and widely referenced by other countries and ordinary companies as a guideline. It has been developed with general usage in mind, regardless of critical infrastructure. Originally, the initial version was released in 2014 to protect the US government and critical infrastructure. The NIST CSF is a cyber-security framework issued by US National Institute of Standards and Technology (NIST). Part 3 explains the NIST Cyber Security Framework (CSF). The purpose of this series is to explain typical examples of general-purpose guidelines for ICS and OT security and understand the concepts required for security in smart factories.
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