DEF CON Forums - OpenCTF (Open Capture The Flag) https://forum.defcon.org/ site) , (twitter).]]> en Mon, 20 Apr 2026 20:22:56 GMT vBulletin 60 https://forum.defcon.org/images/misc/rss.png DEF CON Forums - OpenCTF (Open Capture The Flag) https://forum.defcon.org/