Attacks on the Internet may not produce blood and gore, but they do pose genuine threats to national security and the economy. Credit card theft, bank fraud and other electronic crimes are on the rise. There's evidence that China and Russia have hacked into defense contractors and even the Pentagon. Advisors to the Obama transition team are among those recommending a Center for Cyber-security Operations to be overseen by a special White House advisor. When would a cyber-attack be an act of war? Should intelligence agencies, law enforcement or the military take charge? What about individual privacy?