Balsn

a CTF team from Network Security Lab of National Taiwan University

About Members Awards Contact Writeups CTFtime Twitter

Balsn

News

Balsn CTF is back! This year, Balsn CTF 2020 will feature creative and interesting challenges. We cordially invite you to join the party. Don’t forget to mark it on your calendar!

News-zh-tw

Balsn CTF 回來了! 今年我們會舉辦 Balsn CTF 2020,這次會有許多充滿創意以及有趣的題目,我們誠摯歡迎各位一起來參加這場比賽!請大家記得在行事曆上空出日子,一起來參與這個盛大的宴會吧!

About

Balsn is CTF team from Taiwan founded in 2016. Most of our current members are affiliated with Network Security Lab in National Taiwan University. We actively participate in online and onsite CTF competitions. You can browse our recently participated events and rankings on CTFtime. We also publish writeups on CTF challenges.

We are a group of cybersecurity enthusiasts interested in various areas including software security, binary analysis, web security, cryptography, IoT security, and etc. Besides our own research, all of us enjoy playing CTF because we believe it is an excellent chance to hone our skills in practice, catch up with the latest trend, and most importantly – compete and have fun!

In 2020 summer, Balsn attended DEFCON 28 CTF World Final online as a joint team HITCON⚔Balsn, collaborating with HITCON. We ranked in third place in this great competition.

Team Members

Active Members

yuawn
Current leader of Balsn. Pwning my life. (๑•̀ㅂ•́)ﻭ✧
Github: yuawn
how2hack
Give me flag (・ω・)
sasdf
Yet another Shaman King of Balsn. He focuses on all kinds of challenges.
bookgin
I enjoy playing web challenges!
- Blog: https://bookgin.tw
- Twitter: @bookgin_tw
kevin47
(。>_ŏ)▄︻̷̿┻̿═━一
sces60107
sces60107 (a.k.a Shaman King) knows nothing about reverse engineering and binary exploit, but he knows how to get the flag. This guy specializes in mind-reading and guessing the flag.
qazwsxedcrfvtg14
Warning: He is a dangerous guy. Everything he touched will malfunction in a jiffy.
shw
Blog: https://x9453.github.io/
fweasd
I love CTFs, but they don’t like me…
mainly studied in pwn and crypto
RB363
Nothing to do with RB Tree
hortune
struggling with solidity QQ
Kaibro
∠( ᐛ 」∠)_
Website: kaibro.tw
Blog: blog.kaibro.tw
maojui
ヽ(✿゚▽゚)ノ
Billy
Nothing … Something … Anything … Everything
NiNi
blog: blog.terrynini.tw
tens
PWN!

Honorary Members

Isaac
> “This might be a game, but it isn’t something you play.”
Blog: https://poning.me
ysc
Transfer from pwn to web. Often got a production boost at the last hour of a game.
Blog: https://ysc21.github.io
lwc
Solve the challenges ranging from pwn to crypto, from crypto to bruteforce, from butefore to guessing, from guessing to ESP…
lsc
is my waifu.
bbiiggppiigg
( The challenge I can solve ) ≡ ( The challenge which is too easy )
Xinra
> “Every challenge is brute-forceable if you believe in yourself.”
For me, 500 500 CAPTCHAs are just an hour of human work.
ymk
Welcome to the world of CTF.
laurice
A girl studies in computer science and interested in classical music.
She has absolute pitch and used the ability to decode music in D-CTF final. She is now focusing on the area of machine learning.
lingling
She is a reverse engineer. She reverses what she is interested in and figures out how it does what it does. (especially for Windows OS). Her interests also include Malware Research and Threat Intelligence.
Blog: 0x00.tw
Twitter: @0x000050
YY
A student who interested in binary analysis and like to PWN everything.
pone
pone!

Selected Awards

DEFCON 28 CTF Finals, 3rd place (HITCON⚔Balsn) Online, Aug. 2020
DEFCON 27 CTF Finals, 2nd place (HITCON⚔BFKinesiS) Las Vegas, USA, Aug. 2019
DEFCON 26 CTF Finals, 12th place (BFS) Las Vegas, USA, Aug. 2018
0CTF/TCTF 2020 Quals, 5th place Online, Jun. 2020
0CTF/TCTF 2019 Finals, 2nd place Shanghai, China, Jun. 2019
Codegate CTF 2020 Preliminary, 2nd place Online, Feb. 2020
HITCON CTF 2018, 3rd place (BFKinesiS) Online, Oct. 2018
Trend Micro CTF 2019 Finals, 3rd place Tokyo, Japan, Nov. 2019
Pwn2Win CTF 2019, 2nd place Online, Nov. 2019
TokyoWesterns CTF 5th 2019, 1st place Online, Sep. 2019
Facebook CTF 2019, 2nd place Online, Jun. 2019
PlaidCTF 2019, 4th place Online, Apr. 2019
Teaser Dragon CTF 2019, 3rd place Online, Sep. 2019
N1CTF 2019, 2nd place Online, Sep. 2019
RCTF 2019, 3rd place Online, May. 2019
*CTF 2019, 3rd place Online, Apr. 2019
Teaser CONFidence CTF 2019, 2nd place Online, Mar. 2019
Codegate CTF 2019 Final, 6th place Seoul, Korea, Mar. 2019
HITB-XCTF GSEC CTF 2018 Finals, 5th place Singapore City, Singapore, Sep. 2018
Pwn2Win CTF 2018, 1st place Online, Nov. 2018
Hackover CTF 2018, 2nd place Online, Oct. 2018
ASIS CTF Finals 2018, 5th place Online, Nov. 2018
DefCamp CTF Finals Bucharest, Romania, Nov. 2018
DefCamp CTF Finals Bucharest, Romania, Nov. 2017
Trend Micro CTF 2018 Finals Tokyo, Japan, Dec. 2018
SECCON 2018 Finals Tokyo, Japan, Dec. 2018
SECCON 2017 Finals (1$@AIS3, Balsn) Tokyo, Japan, Feb. 2018

Contact

Please contact us at balsn2015 [at] gmail [dot] com. You can write the mail in Chinese, English or Taiwanese.

If you have any question regarding our writeups, please feel free to create an issue in the writeup repository.


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