Hyunsik Jeong
a.k.a. rbtree / jhs7jhs
wordpress blog.rb-tree.xyzgithub jhs7jhsemail me@rb-tree.xyzPGP›   ctftime rbtreegithub RBTree_Pg_

Skills & Interests

Languages Rust, Python, C/C++, etc.
Good at Reversing, Cryptography, Algorithms & Data Structures
Interested in Binary analysis, Applied cryptography, Software development (including games :D)

Experience

Software Engineer, Kodebox
Seoul, South Korea
Oct 2018 - Dec 2019
1y 2 months
» Mainly developed CodeChain(Link), introducing new features, doing maintenance jobs and optimizations
» Researched on various cryptographic methods used in blockchain technologies
Research Intern, Netmarble
Seoul, South Korea
Jun 2018 - Aug 2018
2 months
» Interned at Netmarble AI Revolution Center (NARC)
» Studied about reinforcement learning algorithms, including Actor-Critic, TRPO & PPO, and applied to game AIs

Education

Korea Advanced Institute of Science and Technology (KAIST) Mar 2020 - PRESENT
» Studying for a master's degree, as a member of SysSec(Link).
Pohang University of Science and Technology (POSTECH) Mar 2015 - Feb 2020
5y
» Bachelor of Scince in Creative IT Engineering & Computer Science and Engineering (Magna Cum Laude)
» Took a break for 1 year, from Mar 2018 to Feb 2019, to rest and do internships
Seoul Science High School Mar 2012 - Feb 2015
3y

Achievement/Awards

CTFs
2020 1st place, Defenit CTF Online
2020 Finalist, DEF CON CTF Online
2020 4th place, PlaidCTF Online
2019 Finalist, Google Capture The Flag Online support
2019 1st place, Hack.lu CTF Online
2019 Finalist, DEF CON CTF United States
2019 3rd place, PlaidCTF Online
2019 Finalist, 0CTF/TCTF China
2019 1st place, Codegate CTF (University division) Seoul, South Korea
2019 1st place, Harekaze CTF Online
2018 Finalist, CODE BLUE CTF Japan
2018 Finalist, Google Capture The Flag United Kingdom
2018 Finalist, DEF CON CTF Online support
2018 4th place, Plaid CTF Online
2018 4th prize, Samsung Capture the Flag Seoul, South Korea
2017 Finalist, HITCON CTF Online support
2017 Finalist, DEF CON CTF United States
2017 4th place, SECUINSIDE CTF Online
2017 4th prize, Samsung Capture the Flag Seoul, South Korea
Programming Competitions
2017 26th place, ACM-ICPC Asia Daejeon Regional Daejeon, South Korea
2016 10th place, ACM-ICPC Asia Daejeon Regional Daejeon, South Korea
2016 5th prize, Samsung Collegiate Programming Cup Seoul, South Korea
2014 Gold prize, Korean Olympiad in Informatics (High school division) Suncheon, South Korea

Portfolio

POSTECH Programming Competition Challenge Author 2018 - 2019
2019 C - Heights | F - Linear-Feedback Shift Register | I - Kaka & Bebe Link
2018 A - Caesar Cipher | G - Turf Wars | I - Line of Bentham Link