Department of Homeland Security Cybersecurity Enhancement Act of 2005

Department of Homeland Security Cybersecurity Enhancement Act of 2005 - Amends the Homeland Security Act of 2002 to establish in the Department of Homeland Security's (DHS's) Directorate for Information Analysis and Infrastructure Protection a National Cybersecurity Office, headed by an Assistant Secretary for Cybersecurity, who shall assist the Secretary of Homeland Security in promoting cybersecurity for the Nation. Grants the Assistant Secretary primary authority within DHS for all cybersecurity-related critical infrastructure programs of DHS.

Includes among the responsibilities of the Assistant Secretary to: (1) establish and manage a national cybersecurity response system, a national cybersecurity threat and vulnerability reduction program, a national cybersecurity awareness and training program, a government cybersecurity program, and a national security and international cybersecurity cooperation program; (2) coordinate specified activities with the private sector and with other directorates and offices within DHS; (3) develop processes for information sharing with the private sector; (4) consult with the Secret Service's Electronic Crimes Task Force on private sector outreach and information activities and with the Office for Domestic Preparedness to ensure that realistic cybersecurity scenarios are incorporated into tabletop and recovery exercises; and (5) consult and coordinate with other Federal agencies on cybersecurity-related programs, policies, and operations and with other relevant Federal agencies and within DHS on security of digital control systems.

Grants the Assistant Secretary primary authority within DHS over the National Communications System.