With the advent of the Internet of Things，more and more objects are connected via various communication protocols like Bluetooth，Z-wave，WiFi , ZigBee etc. Among those protocols ZigBee accounts for the largest market share，it has been adapted to various applications like WSN（Wireless Sensor Network），Smart Home . Over the last few years, large amount of research has been conducted on the security of ZigBee. In this presentation we will introduce a new technique to beat the security of ZigBee, we found the “signature” of the location of the security key . We will go through a specific example and share the thinking process along the way. The techniques used throughout this example can be generalized and used by other hardware reverse engineers. Speaker Bio: Li Jun is currently a hardware security intern in Unicorn Team of Qihoo 360 ,China. He is also a second year graduate student at Chengdu University of Information Technology. He received his bachelor’s degree from University of Electronic Science and Technology of China in 2013.During his college life, he switched between different majors, 2 years in Automobile Electronics,2 years in Electronic and Electric Engineering. He is interested in the security of the Internet of Things and the security of automobile electronics.