The government’s cybersecurity chief has abruptly resigned after one year with the Department of Homeland Security, confiding to industry colleagues his frustration over what he considers a lack of attention paid to computer security issues within the agency. Amit Yoran, a former software executive from Symantec Corp., informed the White House about his plans to quit as director of the National Cyber Security Division and made his resignation effective at the end of Thursday, effectively giving a single’s day notice of his intentions to leave. Full Story