text: U.S. Cybersecurity Chief Abruptly Resigns WASHINGTON - The government's cybersecurity chief has abruptly resigned from the Homeland Security Department amid a concerted campaign by the technology industry and some lawmakers to persuade the Bush administration to give him more authority and money for protection programs.    Amit Yoran, a former software executive from Symantec Corp., made his resignation effective Thursday as director of the National Cyber Security Division, giving a single's day notice of his intention to leave...