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Kin =]

HKer, InfoSec enthusiast currently into Computer Forensics, Wireless Attack, Web Security, GNU/Linux, and Open source. Also hunting CVEs :D

Aspiring to become a professional Red Team operator. INTP-T (MBTI)

CTF TeamICEDTEACTF TeamICEDTEAA Taiwan based CTF team that I am part ofHeapUnderFlowCTF TeamHeapUnderFlowMy current Hong Kong based CTF team
Challenge CreatorNHNC CTFChallenge CreatorNHNC CTFI created challenges and helped with the design side for No Hack No CTF.THJCC CTFChallenge CreatorTHJCC CTFA Taiwai CTF event where I also contributed challenge-related work.
HackingTryHackMePractice PlatformTryHackMeUsed for rooms, labs, and certification tracks.HackTheBoxPractice PlatformHackTheBoxUsed for labs, boxes, and web exploitation practice.CryptoHackPractice PlatformCryptoHackA platform I use for learning and practicing cryptography.
CreatorUmmItOSMy ProjectUmmItOSMy own Arch-based distribution and personal Linux experiment.
CommunityHKPUGCommunityHong Kong Python User GroupI join HKPUG activities and occasionally give talks there.
CandidateOSCPOffensive SecurityOSCPOffensive Security Certified Professional - Advanced penetration testing certification.CWESHackTheBoxCWESCertified Web Exploitation Specialist - Advanced web application security certification.CJCAHackTheBoxCJCACertified Junior Cybersecurity Associate - Entry-level cybersecurity fundamentals.PT1TryHackMePT1Junior Penetration Tester - Foundational penetration testing skills certification.

I’ve been self-taught since I was a kid. Right now I'm studying InfoSec in Hong Kong, and the stuff I keep coming back to is red teaming, reverse engineering, and web hacking. I started taking this seriously around middle school. HTML, CSS, JavaScript first, then C#, VB.NET, a few others. I don't really touch those anymore. Lately it's web hacking and red team work.

I'm a huge GNU/Linux enthusiast. I've tried at least 20 different distros over the years. My main system is Arch Linux, seven years and counting. Yes, I'm still a student with over seven years of experience. I started back in secondary school. Right now I'm running my own Arch-based distribution called UmmItOS, named after my internet nickname. XD

I used to be a Windows user, but I'm now 100% on GNU/Linux. I only touch Windows when I'm attacking Active Directory. Lots of stories from the journey ... this is just a small part :D

GitHub Twitter Youtube

root@ummit.dev(casual)job.inquiry@lamkin.me(job)
GPG Key

Sponsor

Contributions

3,885 contributions in the last year

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Skills

This is my skill :D

Timeline

ICEDTEA CTF

2023 - Present

Team member

HeapUnderFlow CTF

2025 - Present

Core member

No Hack No CTF

Challenge Creator & Web Designer

gitgit & Crackme challenges creator, website designer.

Hong Kong Python User Group (HKPUG)

Member and Occasional talker :)

Join the Hong Kong Python community and occasionally give talks there.

TryHackMe

Active Player

Ranked in the top 4% of TryHackMe players

Zero-Day Hunting

Randomly hunting zero-day vulnerabilities

I do it for fun and learning purposes, no public disclosures yet.

Competition Experience

Only the best runs are listed — I play other CTFs casually too, just not at full effort.

DEF CON CTF Qualifiers 2026

May 22–24, 2026 · IB2XD
26/686 · 4,852 pts

PolyU CTF 2026

Mar 6–8, 2026 · HeapUnderFlow · Sub-degree
3/20 · 11,427 pts / 36 solves
Global: 20/179

HITCON CTF 2025

Aug 22–24, 2025 · ICEDTEA
29/717 · Taiwan Top 4

HKCERT CTF 2025

Dec 19–21, 2025 · HeapUnderFlow · Open
29/597

Stacks

The Stacks for my development, hacking, and daily use. Cannot list all here, just the main ones :)