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What is Demilitarized Zone (DMZ)

Chapter 9
Cyber Security and Safety of Nuclear Power Plant Instrumentation and Control Systems
Physical or logical subnetwork that contains and exposes an organization's external-facing services to an untrusted network, usually a larger network such as the Internet. The purpose of a DMZ is to add an additional layer of security to an organization's local area network: an external network node can access only what is exposed in the DMZ, while the rest of the organization's network is firewalled. The DMZ functions as a small, isolated network positioned between the Internet and the private network and, if its design is effective, allows the organization extra time to detect and address breaches before they would further penetrate into the internal networks.
Published in Chapter:
Cyber Security Assessment of NPP I&C Systems
Oleksandr Klevtsov (State Scientific and Technical Center for Nuclear and Radiation Safety, Ukraine), Artem Symonov (State Scientific and Technical Center for Nuclear and Radiation Safety, Ukraine), and Serhii Trubchaninov (State Scientific and Technical Center for Nuclear and Radiation Safety, Ukraine)
Copyright: © 2020 |Pages: 18
DOI: 10.4018/978-1-7998-3277-5.ch009
Abstract
The chapter is devoted to the issues of cyber security assessment of instrumentation and control systems (I&C systems) of nuclear power plants (NPP). The authors examined the main types of potential cyber threats at the stages of development and operation of NPP I&C systems. Examples of real incidents at various nuclear facilities caused by intentional cyber-attacks or unintentional computer errors during the maintenance of the software of NPP I&C systems are given. The approaches to vulnerabilities assessment of NPP I&C systems are described. The scope and content of the assessment and periodic reassessment of cyber security of NPP I&C systems are considered. An approach of assessment to cyber security risks is described.
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Chapter 9
Firewalls as Continuing Solutions for Network Security
A buffer between two networks of differing security levels which usually contains certain services/hosts to which both networks require access.
Published in Chapter: Firewalls as Continuing Solutions for Network Security; From: Handbook of Research on Information Security and Assurance
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