Balsn
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 2019 summer, Balsn attended DEFCON 27 CTF World Final in Las Vegas as a joint team HITCON⚔BFKinesiS. The joint team consists of 5 different CTF teams from Taiwan, including HITCON, Balsn, BambooFox, DoubleSigma and KerKerYuan. We are so proud to rank in second place in such a great competition. It’s also a pleasure to collaborate with HITCON to attend this event.
Team Members
Active Members
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yuawn Current leader of Balsn. Pwning my life. (๑•̀ㅂ•́)ﻭ✧ Github: yuawn |
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how2hack Give me flag (・ω・) |
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sasdf Yet another Shaman King of Balsn. He focuses on all kinds of challenges. |
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bookgin I enjoy playing web challenges! - Blog: https://bookgin.tw - Twitter: @bookgin_tw |
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kevin47 (｡>_ŏ)▄︻̷̿┻̿═━一 |
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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. |
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qazwsxedcrfvtg14 Warning: He is a dangerous guy. Everything he touched will malfunction in a jiffy. |
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shw Blog: https://x9453.github.io/ |
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fweasd I love CTFs, but they don’t like me… mainly studied in pwn and crypto |
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RB363 Nothing to do with RB Tree |
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cli4125 A very beginner who interest in pwn and reverse engineering. Now study in NTU-EECS. |
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hortune struggling with solidity QQ |
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treetree If you see a 🌲 walking on the sidewalk. That’s me. 🙂 |
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Kaibro ∠( ᐛ 」∠)＿ Website: kaibro.tw Blog: blog.kaibro.tw |
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maojui ヽ(✿ﾟ▽ﾟ)ノ |
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Billy Nothing … Something … Anything … Everything |
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NiNi blog: blog.terrynini.tw |
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tens PWN! |
Honorary Members
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Isaac > “This might be a game, but it isn’t something you play.” Blog: https://poning.me |
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ysc Transfer from pwn to web. Often got a production boost at the last hour of a game. Blog: https://ysc21.github.io |
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lwc Solve the challenges ranging from pwn to crypto, from crypto to bruteforce, from butefore to guessing, from guessing to ESP… |
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lsc is my waifu. |
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bbiiggppiigg ( The challenge I can solve ) ≡ ( The challenge which is too easy ) |
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Xinra > “Every challenge is brute-forceable if you believe in yourself.” For me, 500 500 CAPTCHAs are just an hour of human work. |
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ymk Welcome to the world of CTF. |
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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. |
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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 |
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YY A student who interested in binary analysis and like to PWN everything. |
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pone pone! |
Selected Awards
| DEFCON 27 CTF Finals, 2nd place (HITCON⚔BFKinesiS) | Las Vegas, USA, Aug. 2019 |
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| Codegate CTF 2020 Preliminary | Online, Feb., 2020 |
| DEFCON 27 CTF Qualifier, 2nd place (HITCON⚔BFKinesiS) | Online, May. 2019 |
| DEFCON 26 CTF Final, 12th place (BFS) | Las Vegas, USA, Aug. 2018 |
| HITCON CTF 2018, 3rd place (BFKinesiS) | Online, Oct. 2018 |
| 0CTF/TCTF Finals, 2nd place | Shanghai, China, Jun. 2019 |
| 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, March 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.