U.S. cybersecurity czar Richard Clarke will step down after he finishes a comprehensive Internet-security plan next month, industry and government sources said Tuesday. Clarke, a longtime White House aide who has led efforts to combat terrorism and bolster the security of the nation’s computer systems, will look for work in the private sector rather than take a position in the new Department of Homeland Security, people close to the situation said. Sources suggested that Clarke was unsatisfied with the new positions offered him, as they would be a step down from his current role as national point man for cybersecurity efforts. A spokesman with Clarke’s office declined to comment. Full Story