Critical infrastructure are those types of infrastructures that provides critical services to the people, if any type of blockage, destruction or it is interference id done to these facilities can severely damage the lifestyle or life of the people living in that area. According to Department of Homeland Security critical infrastructure is explained as “it provides the essential service underpin the American society and serves as the backbone of our national’s economy, security and health” (DHS, n.d.). According to National Geospatial Agency 18 sectors of critical infrastructures exists in The United States of America. Critical infrastructures include; agriculture and food; banking and finance; chemical; commercial facilities; communications; critical manufacturing; dams; defense industrial base; emergency services; energy; government facilities; health care and public health; information technology; national monuments and icons; nuclear reactors, materials, and waste; postal and shipping; transportation systems; and water(Ferro, et. al., 2010).
Destruction of any of above mentioned facility could be catastrophic to the health and security of the American people hence, cybersecurity plays a vital role in protecting these assets. On February 12, 2013 President Obama released Presidential Policy Directive (PPD-21),which directs government agencies to provide proactive and coordinated efforts to strengthen and maintain, secure, functioning, and resilient critical infrastructures including assets, networks and systems that are critical to public confidence and Nation’s safety, prosperity, and wellbeing. Also, in the directive PPD-21, it identifies 16 critical infrastructures sectors and designates roles and responsibilities of Sector specific Agency (SSA). For example, the responsibility of Information technology is DHS, the responsibility of Water and Wastewater system is Environmental Protection Agency, the responsibility of Government facility is DHS and General
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