Once upon a time, people's privacy was pretty much taken care of by curtains and shades. Their security, in terms of their physical safety and possessions, was achieved-or attempted to be achieved-with moats, walls, rivers, and oceans. But that was then. Since then, modernity has exacted a price. Matters of privacy and security have become greatly complicated, and both are immersed in fast and furious cross-currents. The Department of Homeland Security's (DHS) mission of preventing terrorist attacks on the homeland intersects with privacy concerns at many levels. DHS is also tasked, as are other federal agencies and the Department of Commerce, with confronting threats in cyberspace. "Protecting security of consumers, businesses, and the Internet infrastructure has never been more difficult," said Commerce Secretary Gary Locke recently. "Cyber attacks on Internet commerce, vital business sectors, and government agencies have grown exponentially." In this monograph we survey the main currents-the public and the private, the governmental and commercial, legislative and judicial-and look at how partnerships between industry and government are striving to keep privacy and security in balance.  Read the monograph.