DEF CON 27, Wireless Village, Babak Javadi's 'Basics Of Hacking Physical Access Control Systems' → December 22, 2019 by Marc Handelman in Conferences, DEF CON 27, Education, Information Security, Wireless Security, Wireless Networks 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.