Information

Kyeong Kyuchang

Hello, I’m KYEONG KYUCHANG 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/13u9-kyeong

Code4rena: 13u9 CodeHawks: 13u9

Education

• Kookmin University (Seoul) / Department of Information Security, Cryptology, and Mathematics (March 2019 ~ Feb 2025)
  • Hashcat (University Club) @ President & Educator (2023 ~ Now)
• KITRI Best Of The Best: BoB 10th (2021 ~ 2022.03)

Organization

• ??? (~ Now, until 2026.6.30)
• Team H4C @ WhiteHat Hacking Team (2020 ~ Now)
• **B4C Harder Study - RedTeam Track Mentor (2025 ~ 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 3 High and 10 Medium vulnerabilities in Code4rena.
• Build LLM Audit Tools (Self Toy Project)
  • https://github.com/l3u9/LLM_Audit
  • “Building LLM Audit Tools 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)

2022

• Team H4C "Hacking Owls 3rd" Public Seminar: Presented "Drone Vulnerability Research Progress" (2022)

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

• Team H4C "Hacking Owls 6th" Public Seminar: Presented "Thinking Lke an Attacker" (2022)
• 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 3 High and 10 Medium vulnerabilities (~ Now)

CVEs

• CVE-2021-46896
• CVE-2021-34125

Reserved CVEs

• CVE-2021-44107
• CVE-2021-44996
• CVE-2021-44999
• CVE-2021-45000
• CVE-2021-45001
• CVE-2021-45002

Updated Database

Audit Reports

Audit Reports

Research & Project

Research database

Web3 Study

Web3 database

RedTeam database

Statistic