Tech leaders who are at odds with the administration over government surveillance stayed away from his speech.
The former NSA contractor thinks the U.S. has been too focused on offensive capabilities.
Xbox Live services were restored on Friday and Sony's PlayStation late Saturday following the Christmas Eve hack.
Files leaked include executives' salaries and a script from the Breaking Bad creator
Head of NSA warns that we could soon see cyber attacks regularly attacking critical infrastructure
The attack marks one of the largest data breaches in history