Jianjun Dai (@Jioun_dai) is a security researcher of Qihoo360 Alpha Team, he focus on Android system security research, vulnerability hunting and exploiting development. Previously, he is a security developer, major work include network protocol analysis, vulnerability detection, botnet and backdoor detection, sandbox technology research and development, etc. He have been in Android vulnerability research for more than two years, he found lots of vulnerabilities in AOSP, and won the Bug Bounty. He is a speaker at the CanSecWest conference.