http://g7ejphhubv5idbbu3hb3wawrs5adw7tkx7yjabnf65xtzztgg4hcsqqd.onion/html/defcon-23/dc-23-workshops-schedule.html
He has worked on various security software including UTM appliances, messaging/security appliances, anti-spam engine, anti-virus software, Transparent HTTPS proxy with captive portal, bayesian spam filter to name a few. He is an active speaker at security and open source conferences; some of the conferences he has spoken at include AusCERT, Defcon, Hack.lu, Black Hat, PHDays, Xcon, Cyber security summit - Bangalore, Cocon, OSI Days - Bangalore, Clubhack, Gnunify.