Cybersecurity B.S. Student @ Purdue University

President of b01lers @ Purdue.

Active member of Taiwanese CTF Team TSJ. Part of Balsn.217@TSJ.tw

Specialize in Pwnable, Crypto, and all kind of miscellaneous challenges.

I enjoy researching cool tricks and quirks in various computing systems and languages, as well as optimizing thing with techniques and algorithms.


  • b01lersCTF 2023 - Padlock

    For the past year, b01lers has been a huge success in my opion, with our 2023 edition of b01lers CTF, more interesting challeges are solved by the curious individuals. We received a lot of feedback, and most of them are positive! I’m glad for hosting such a wholesome event for everyone :)


  • ACSC 2023 Writeup

    This year I participated in Asian Cyber Security Challenge and placed 38th place out of all participants. This documents the writeups for all of the challenges I solved. The writeup will be in chronological order ;) Challenge solved after the competition are marked as [*]


  • HackTM 2023 - d-phi-enc

    In CTF, there are many people who mistakenly encrypt p, q in RSA.
    But this time...
    
    Solves: 51 solves
    

  • GoogleCTF 2022 - segfault labyrinth

    Be careful! One wrong turn and the whole thing comes crashing down
    
    nc segfault-labyrinth.2022.ctfcompetition.com 1337
    
    Solves: (189 pt/ 56 solves)
    

  • TetCTF 2022 - Ezflag

    We found an internal storage system exposed to the internet. By ambushing one of the employee, we got some files and the credentials of the system: "admin:admin". Unfortunately, our agent was poisoned and cannot continue hacking. Can you help us?
    
    Service: http://18.220.157.154:9090/
    or
    Service: http://3.22.71.49:9080/
    
    Author: @nyancat0131
    Solves: 47(part1) / 20(part2) / 591
    

  • HITCONCTF - cclemon

    Speak in 🍋
    
    Author: david942j
    Solved: 24/286
    

  • HITCONCTF - baba is game

    JIJI IS SHUT
    JIJI IS STOP
    TEXT HAS TEXT
    JIJI IS JIJI
    BABA IS YOU
    JIJI IS OPEN
    JIJI IS NOT YOU
    HEDGE IS STOP
    JIJI HAS JIJI
    TEXT IS NOT YOU
    
    nc 35.72.58.250 5566
    
    Author: ddaa
    Solves: 16/286
    

  • BalsnCTF 2021 - dark knight

    Category: Misc
    Author: 424275
    
    Solves: 12 / 278
    
    once upon the ime, there was a dark knight who kills every admin he met...
    
    nc darkknight.balsnctf.com 8084
    

  • ALLES!CTF 2021 - entrAPI

    Category: Misc
    Difficulty: Medium
    Author: Flo
    
    Solves: 5 / 523
    
    A very simple stegano tool that estimates the entropy of sections of a file by counting unique bytes in a range. Here's a snippet of the Dockerfile to get you started:
    
    COPY main.js index.html flag /
    RUN deno cache main.js
    EXPOSE 1024
    CMD deno run -A main.js
    
    Happy guessing! :^)