Secretary of the Department of Homeland Security Michael Chertoff speaks at the London School of Economics in London, in this Dec. 12, 2008 file photo. Chertoff has a handful of golden rules for what he calls good Internet hygiene THE CANADIAN PRESS/AP/Matt Dunham Secretary of the Department of Homeland Security Michael Chertoff speaks at the London School of Economics in London, in this Dec. 12, 2008 file photo.