National Cyber Security Division

"NCSD" redirects here. For other uses, see NCSD (disambiguation).

The National Cyber Security Division (NCSD) was a division of the Office of Cyber Security & Communications, within the Cybersecurity and Infrastructure Security Agency (CISA) in the United States Department of Homeland Security (DHS). Formed from the Critical Infrastructure Assurance Office, the National Infrastructure Protection Center, the Federal Computer Incident Response Center, and the National Communications System, the NCSD opened on June 6, 2003. The NCSD was disbanded some time before November 2023.

According to Deputy Assistant Secretary Michael Brown, NCSD's mission was to "conduct risk assessments and mitigate vulnerabilities and threats to information technology assets and activities affecting the operation of the civilian government and private sector critical cyber infrastructures." This included "cyber threat and vulnerability analysis, early warning, and incident response assistance" for organizations in the public and private sector. NCSD carried out the majority of its responsibilities under the Comprehensive National Cybersecurity Initiative.

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