text: Purdy Tapped as Cyber-Security Director The Department of Homeland Security has filled the nation's top cyber-security post after the previous chief abruptly resigned last week, choosing the former director's deputy to take over the position. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2" color="#666666"&gt;&lt;B&gt;-washingtonpost.com&lt;/B&gt;&lt;/FONT&gt;