DEF CON Forums - OpenCTF (Open Capture The Flag) https://forum.defcon.org/ site).]]> en Mon, 27 Apr 2026 11:58:40 GMT vBulletin 60 https://forum.defcon.org/images/misc/rss.png DEF CON Forums - OpenCTF (Open Capture The Flag) https://forum.defcon.org/