정보
sean9892
I’m Yubin Choi(최유빈), and an undergraduate student at KAIST.
Currently I’m serving in ROK Air Force (2024.02.13-2025.11.12).
Education
- KAIST
- B.S. in School of Computing (2022-Current)
- Chungbuk Science High School
- an year early graduated (2020-2021)
Competitions and Awards
- Security Competitions
- 2025 암호분석경진대회 우수상 - Team 암호말잔치
- 2022 WITHCON(화이트햇 콘테스트) 4th place - Team GoN
- 2022 암호분석경진대회 대상 - Team KAIST GoN
- Security Competitions - Military Division
- 2024 WITHCON(화이트햇 콘테스트) 1st place - Team 키보드워리어플랫폼
- 2024 CCE(사이버공격방어대회) 5th place - Team 카리나보단 우정잉
- 2024 국방 사이버보안 경연대회 3rd place - Team 공CERT군
Portfolio
- Published Crypto Challenges to Dreamhack (2021-Current)
- Double Barrel: (not solved yet)
- Elliptic Power of CRC: Revenge Challenge of
Power of CRC; zeroing out CRC value on hidden finite field without solving discrete logarithm
- Challenge Author for KAIST GoN Qual (2023-Current)
- Verhältnis: Solving HNP-2H to recover two small integers from their 2-hole masked ratio over the given finite field
- Hoshimachi: LFSR output prediction without solving for full states
- Double Linear: seed recovery on LFSR which adopts AES with a linear s-box as a filter function
- Is it CRT-RSA?: Factoring two RSA moduli with general solution for linear diophantine equation
- Challenge Author for HSPACE Belluminar CTF (2024)
- BabyHash: topological sort to combine inversed hash values with rainbow-table attack on small plaintext space
Extracurricular activities
- Member of Cryptology Wargame Website CryptoHack (2020-Current)
- Solved 233/233 regular challenges, 41st 100%-cleared