Information

13u9

Hello, I’m 13u9 I graduated from Kookmin University from 2019 to February 2025. I completed the BoB 10th program from 2021 to March 2022, and since then, I’ve been working at ???. I’ve been an active member of Team H4C, a hacking team, from 2020 to the present.

[13u9]

Blog: https://13u9.wiki

Gmail: [email protected]

X: @13u9_kyeong

Github: https://github.com/l3u9

Code4rena: 13u9 CodeHawks: 13u9

Organization

• Working at ????? (2022.07~ Now, Maybe until 2026.07)
• Kookmin University / Department of Information Security, Cryptology, and Mathematics (~ Feb 2025)
• KITRI Best Of The Best: BoB 10th (2021 ~ 2022.03)
• Team H4C @ WhiteHat Hacking Team (2020 ~ Now)
• Hashcat (University Club) @ President & Educator (2023 ~ Now)

Project

• Drone Vulnerability Research Project @ BoB (2021)
  • https://github.com/BOB4Drone/Drone_Hacking_Guideline_ENG
  • Developed a fuzzer and conducted root cause analysis.
• Blockchain Web3 Audit Contest@ CodeHawks & Code4rena (2023.11 ~ Now)
  • Found 1 High vulnerability in CodeHawks.
  • Found 2 High and 8 Medium vulnerabilities in Code4rena.
• Build LLM Audit Tools (Self Toy Project)
  • https://github.com/l3u9/LLM_Audit
  • “Building an LLM Smart Contract Audit Tool series”

Activities

2021

• Shakti CTF 4th (2021.4.3~ 2021.4.4)
• Team H4C "Hacking Owls 1st" Public Seminar: Presented "Cryptography Basics" (2021)
• BoB Drone Vulnerability Research Project: Fuzzer Development & Root Cause Analysis (2021)
• Korean Information Security Conference (Winter): Submitted and Presented '11/11 PX4 Autopilot MAVLink Module Vulnerability Analysis' (2021)

2023

• Founded and Operated Hashcat (University Club): Served as President & Educator (2023)
• CCE National University Club Alliance Seminar: Presented "Thinking Like an Attacker (Intro)" (2023)
• Team H4C "Hacking Owls" Public Seminar: Presented "Thinking Like an Attacker" (2023)

2024

• 03/22 KITRI BoB 1st Re-BoB Alumni Project Competition: Received Prize (2024)
• KISIA Lectures: Conducted "Thinking Like an Attacker" for Two Cohorts (2024)
  • Covered Pwnable Basics, Fuzzing, and Thinking Like an Attacker in three parts.
• Presented "My Journey of Studying Smart Contract Auditing" at Korea University Blockchain Valley (2024)

Bug Hunting

CodeHawks (Web3)

• CodeHawks (High): Found 1 High vulnerability (~ Now)

Code4rena (Web3)

• Code4rena: Found 2 High and 8 Medium vulnerabilities (~ Now)

CVEs

• CVE-2021-46896
• CVE-2021-34125

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