Experience

Full-time Security Researcher, SEWorks Inc.	Sept 2018 - 0 month
» Mainly focusing on web security researches and automated security analysis. » Developing and Maintaining flagship products.

Signaller, ROK Army	Nov 2016 - Aug 2018 1y 8 months
» Discharged as Sergeant. Received many awards while working in the army. » Maintained internal systems, managed and monitored security firewalls. » Developed an application which automatically checks security status and prints out the report on every boot. » Developed the pentest software to increase awareness on the side-effects of using smartphones in the army.

Full-time Security Researcher, SEWorks Inc.	June 2014 - Nov 2016 2y 4 months
» Focused mainly on core server management and backend service development. » Developed core products, including product maintanence. (Uses python, GoLang+Redis, PHP, Java, etc.) » Frequently performed vulnerability checks and penetration tests on flagship products. » Focused on security researches for future developments.

Education

Undergraduate Student, University of Toronto	Sept. 2014 - June 2015 9 months
» Currently studying as an undergraduate, and is going to acquire a Bachelor’s degree. » Currently on a long leave for jobs.

International Baccalaureate Diploma	Sept. 2012 - June 2014 1y 9 months
» Acquired International Baccalaureate Diploma for Secondary School. » Studied in an Indian International school. (Physics HL, Computer Science HL, Mathematics HL, English B HL, Korean A SL, Economics SL)

International
2017	Finalist, CodeGate CTF 2017	Seoul, South Korea
2016	1st place @ CTFTime! \o/
2016	2nd place, EKOPARTY CTF 2016	Latin America
2016	2nd place, Silk Road CTF 2016	Karamay, China
2016	1st place, ASIS CTF Finals	Tehran, Iran
2016	1st place, C4CTF 2016	Riyadh, Saudi Arabia
2016	1st place, TU CTF 2016	Tulsa, OK
2016	1st place, Sharif University CTF	Tehran, Iran
2016	2nd place, Internetwache CTF	Berlin, Germany
2016	Finalist, PHDays 2016	Moscow, Russia
2015	1st place, Hack Zone Tunisia 2015	Manouba, Tunisia
2015	1st place, Break In 2015	Hyderabad, India
2015	Finalist, CSAW CTF 15 Hacking Competition NA Finals	Brooklyn, NY
2014	Finalist, CSAW CTF 14 Hacking Competition NA Finals	Brooklyn, NY
2014	Finalist, DEFCON 22nd CTF Hacking Competition World Finals	Las Vegas, NV
2014	2nd place. Olympic Sochi CTF 2015 (Acquired DEFCON Qualifier)
Domestic
2015	1st place, 14th HUST Hacking Festival	Seoul, South Korea
2015	1st place, 2015 Inc0gnito Hacking Competition	Seoul, South Korea
2018	1st place, Korean Army Hacking Defense Contest	Daejeon, South Korea

» I’m not actively participating in any CTFs at the moment.

» I’ve done a lot of competitions so far since 2012. Writeups on some of these are archived in github.

» If you need writeups on ones that I didn't publish, please feel free to contact me.

CTF Organizer and Security Challenge Author

2014 - PRESENT

2014-2016	Organizer and Author, KAIST and POSTECH Science War (Hacking Part).
	» Some of challenged released in the Science War can be played in Stereotyped Challenges
2018	Author, moehost and gameshop, ASISCTF 2018 Quals. Writeups are available here.
	More to come...

Web Fuzzer Development and its Utilization	June 2014
Talked on WOWHACKER 2^nd Seminar. Seoul, Korea » a.k.a. Introduction to web fuzzer development. » Demonstrated the process of web fuzzer development and its utilization, including the practical usage of fuzzers and its utilizations. » Presentations available at //goo.gl/VabWPK

Stereotyped Challenges	Oct. 2014 - PRESENT 3y 11 months
//chall.stypr.com » Operating and developing a website consisting of extremely technical offensive security challenges. » Most of challenges are solely developed and tested by me. all challenges are sandboxed seperately. » Sourcecode of the website is currently available on //github.com/stypr/chall.stypr.com

Language	PHP (Native), Python (Native), SQL (Native), VB (Mediocre), C (Mediocre), Go (Mediocre), Java (Mediocre), ASM (Beginner)
	Korean (Native), English (Native), Mandarin (Beginner), Japanese (Beginner)
Softwares	WireShark, Chrome/Firefox devtools, WireShark, Hex-rays, My Own Fuzzer, x64dbg, NetCat, Fiddler
	HeidiSQL, HxD, Git, VMWare, qemu, ESXi, etc.