Bio

JunYoung Choi, also known as ji9umi, is an offensive security researcher at STEALIEN, Inc.

You can find more about me on LinkedIn.

Work Experience

In The Forest

February 2022 ~ March 2023, Junior Vulnerability Researcher, member of R&D

• N-day vulnerability research targeting IoT devices
• Exploit development targeting Android systems

STEALIEN

March 2023 ~ April 2024, Senior Researcher, member of Pentesting Team

• Penetration testing Web/Mobile

April 2024 ~ Present, Senior Researcher, member of Defend Forward Team

• White-box Web/App code auditing
• Penetration testing IoT devices

Achievements

Pwn2Own 2024 Ireland

Team STEALIEN

• Ubiquity Ai Bullet, $30,000
• Lorex 2K camera, $3,750

Skills Competition

• 2020 Incheon Regional / IT Network System / Gold medal
• 2020 National / IT Network System / Encouragement prize
• 2021 Incheon Regional / Cyber Security / Gold medal
• 2021 National / Cyber Security / Bronze medal

Education

Incheon Electronic Meister High School

March 2018 ~ January 2021, Student

• Department of Information and Telecommunication Technology

  = Basic Electronic Circuit = Basic Programming Language = Advanced Network Engineering

K-Shield Jr.

March 2021 ~ June 2021, Trainee

• Security consultant track