As the backbone of society, electrical infrastructures have become one of the prime targets for unethical actors in the cyberspace. Electrical outages have a direct impact on society. This paper focuses on the need for cybersecurity practices within industrial control systems. The discussion highlights cybersecurity threat vectors and the required architecture design to mitigate threats using firewalls, IDS/IPS and DMZs. In addition to technological security mechanisms and security policies, procedures and standards also help in strengthening the layered security mechanism of defence in depth. This paper deliberates on the importance of log management, patching, system hardening and periodic assessments to proactively take a system-wide defensive approach for mitigating cybersecurity threats.
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