DEF CON 27, Appsec Village, Jillian Ratliff's 'Vulnerabilities That Hide From Your Tools' → January 15, 2020 by Marc Handelman in Application Security, Conferences, DEF CON 27, Information Security Thanks to Def Con 27 Volunteers, Videographers and Presenters for publishing their superlative conference videos via their YouTube Channel for all to see, enjoy and learn.