US national security leaders and top cyber warriors from around the world are gathering here to plot defenses against criminals and spies that increasingly plague the Internet. Homeland Security Secretary Janet Napolitano and White House Cyber Security Coordinator Howard Schmidt will take part in this week's RSA conference along with computer defense companies and technology icons such as Apple co-founder Steve Wozniak and Craigslist creator Craig Newmark. "We have before us more data moving into the cloud and more sophisticated cyber criminals," said Qualys chief executive Philippe Courtot, who is among the keynote speakers at the premier event that kicks...