|Security Engineer, LINE Corporation
|Feb 2019 -
» Mainly focusing on internal security pentests on LINE and its affiliates' products.
» Developed automated security analysis tools and tools for detecting potential risks.
» Reviewing bugbounty reports, recruitment support.
|Security Researcher, SEWorks Inc.
Seoul, South Korea
|June 2014 - Nov 2018
4y 5 months
» Focused mainly on core server management and backend service development.
» Developed core products, including product maintanence. (Used python, GoLang+Redis, PHP, Java, etc.)
» Frequently performed vulnerability checks and penetration tests on flagship products.
» Focused on security researches for future developments.
|Signaller, ROK Army
Paju, South Korea
|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 a pentest software to increase awareness on side-effects of using smartphones in the army.
|Undergraduate Student, University of Toronto||Sept. 2014 - June 2015
|» Currently studying as an undergraduate, and is going to acquire a Bachelor’s degree at some point.
» 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.
|2019||Finalist, DEFCON 26 CTF||Las Vegas, NV|
|2019||1st place, 0CTF 2019||Shanghai, China|
|2018||Finalist, Real World CTF 2018||Zhengzhou, China|
|2017||Finalist, CodeGate CTF 2017||Seoul, South Korea|
|2016||1st place on ctftime as team dcua.|
|2016||2nd place, EKOPARTY CTF 2016||Latin America|
|2016||2nd place, Silk Road CTF 2016||Karamay, China|
|2016||1st place, ASIS CTF 2016 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||Brooklyn, NY|
|2014||Finalist, CSAW CTF 14 Hacking Competition||Brooklyn, NY|
|2014||Finalist, DEFCON 22nd CTF||Las Vegas, NV|
|2014||2nd place. Olympic Sochi CTF 2015|
|2019||1st place, Cyber Operations Challenge (Whitehat Contest)||Seoul, South Korea|
|2018||1st place, Korean Army Hacking Defense Contest||Daejeon, South Korea|
|2015||1st place, 14th HUST Hacking Festival||Seoul, South Korea|
|2015||1st place, 2015 Inc0gnito Hacking Competition||Seoul, South Korea|
|CTF Organizer and Security Challenge Author||2014 - PRESENT|
|Web Fuzzer Development and its Utilization||June 2014|
Talked on WOWHACKER 2nd 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
4y 11 months
» 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