text: Top US cyber-security official resigns WASHINGTON -- The nations top cyber-security official has resigned unexpectedly, raising new questions about the progress of efforts to protect the nations vast computer networks from terror attacks, electronic viruses and other threats, government 
inputs: Top US cyber-security official resigns WASHINGTON -- The nations top cyber-security official has resigned unexpectedly, raising new questions about the progress of efforts to protect the nations vast computer networks from terror attacks, electronic viruses and other threats, government 