Gen. Keith B. Alexander, commander, U.S. Cyber Command and director, National Security Agency/Chief, Central Security Service testifies on Capitol Hill in Washington, Wednesday, June 12, 2013, before the Senate Appropriations Committee hearing to examine cybersecurity, focusing on preparing for and responding to the enduring threat. (AP Photo/Charles Dharapak)

Associated Press
Gen. Keith B. Alexander, commander, U.S. Cyber Command and director, National Security Agency/Chief, Central Security Service testifies on Capitol Hill in Washington, Wednesday, June 12, 2013, before the Senate Appropriations Committee hearing to examine cybersecurity, focusing on preparing for and responding to the enduring threat. (AP Photo/Charles Dharapak)
Gen. Keith B. Alexander, commander, U.S. Cyber Command and director, National Security Agency/Chief, Central Security Service testifies on Capitol Hill in Washington, Wednesday, June 12, 2013, before the Senate Appropriations Committee hearing to examine cybersecurity, focusing on preparing for and responding to the enduring threat. (AP Photo/Charles Dharapak)
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