The origins of DefCon This week we have the DefCon 20 and Black Hat computer security conferences in Las Vegas — reasons enough for me to do 2-3 columns about computer security. These columns will be heading in a direction I don’t think you expect, but first please indulge my look back at the origin of these two conferences, which were started by the same guy, Jeff Moss, known 20 years ago as The Dark Tangent.