DEF CON (also written as DEFCON, Defcon or DC) is one of the world's largest hacker conventions, held annually in Las Vegas, Nevada, with the first DEF CON taking place in June 1993.
DEFCON (也写做 DEF CON, Defcon, or DC) 是全球最大的计算机安全会议之一，自1993年6月起，每年在美国内华达州的拉斯维加斯举办。