Cheng-Da Tsai, also as known as Orange Tsai, is member of DEVCORE and CHROOT from Taiwan. Speaker of conference such as HITCON, WooYun and AVTokyo. He participates numerous Capture-the-Flags (CTF), and won 2nd place in DEF CON 22 as team member of HITCON.

Currently focusing on vulnerability research & web application security. Orange enjoys to find vulnerabilities and participates Bug Bounty Program. He is enthusiasm for Remote Code Execution (RCE), also uncovered RCE in several vendors, such as Facebook, Uber, Apple, GitHub, Yahoo and Imgur.