Personal portfolio and CTF writeup archive for R3izorr.
I'm Chris / Chien Nguyen, a Computer Science student at NTU Singapore and an aspiring cybersecurity engineer focused on reverse engineering, binary exploitation, and CTFs.
This site is a compact place to review my work:
- who I am and what I am learning
- selected software and security projects
- GitHub repositories worth checking
- CTF writeups organized by event, category, and tags
- links to contact me or view my profiles
Quick overview of my background, current focus, featured work, skills, and links.
Selected projects from my GitHub profile, including:
CTF_writeup— my public CTF writeup collectionsc2006-proj— Hawker Opportunity Score PlatformAgenticNetSec— PCAP investigation and ransomware campaign analysis toolConnect-codex-with-android-via-termux— Android-to-Ubuntu remote Codex CLI workflow guidefact_checker_AI— early AI-assisted fact-checking prototypeChecksum-.text-in-androidNDK— Android NDK ELF.textintegrity checkerhome-net-drift-monitor— Python home network drift monitorSC2002-GRP5— Java BTO management systemblog— personal blog experiment
Each project page gives a short technical review: purpose, stack, links, and notes.
Writeups are grouped by:
- year
- CTF event
- category:
pwn,rev,web,crypto,forensics,osint,misc - tags
Most writeups focus on pwn and reverse engineering, with notes on exploit strategy, reversing process, bugs, payloads, and takeaways.
- Reverse engineering
- Binary exploitation
- Linux/glibc internals
- Android native security
- Web-to-pwn challenge chains
- Full-stack projects with TypeScript and Python
- GitHub: https://github.com/R3izorr
- LinkedIn: https://www.linkedin.com/in/tr%E1%BA%A7n-chi%E1%BA%BFn-nguy%E1%BB%85n-951534252/
Some writeups may include challenge-specific flags, exploit snippets, or security research details from public CTF challenges. They are kept for learning, review, and portfolio purposes.