🔎Info

  • Name
    • Joonwon Yoon (JSec)
  • Nation
    • South Korea
  • Affiliation
    • Defenit (Leader)
    • Hayyim Security (Researcher)
  • Site

🏆Awards

  • 2021
    • Pwn2Win CTF 2021 2nd place - uuunderflow
    • 2021 Hspace CTF The Zero 1st place - JSec (iPad 7th generation)
  • 2020
    • 2020 Christmas CTF 4th place - Haim (400,000 KRW)
    • Hackceler8 2020 2nd place - I Use Bing (2000 USD)
    • SECCON OnlineCTF 2020 1st place - HangulSarang
    • TeamH4C CTF 1st place - JSec (100,000 KRW)
    • Dreamhack CTF Pre-Season Round #1 1st place - JSec (300,000 KRW)
    • CCE Quals 2020 3rd place - Haim
    • TokyoWesterns CTF 6th 2020 1st place - D0G$
    • InterKosenCTF 2020 2nd place - Defenit
    • DEF CON CTF Final 2020 12th place - koreanbadass
    • CyBRICS CTF 2020 2nd place - DefenitelyZer0 (2000 USD)
    • TSG CTF 2020 2nd place - DefenitelyZer0 (213.37 USD)
    • ASIS CTF Quals 2020 2nd place - DefenitelyZer0
    • DEF CON CTF Qualifier 2020 7th place - koreanbadass
    • PlaidCTF 2020 4th place - koreanbadass
    • Securinets CTF Quals 2020 2nd place - Defenit
    • riftCTF 2020 3rd place - Defenit
    • CONFidence CTF Teaser 2020 1st place - DDP
    • BauCTF Winter Quals 2020 1st place - Defenit
    • NEWSECU CHALLENGE 2020 3rd place - Defenit (100,000 KRW)
  • 2019
    • Christmas CTF 2019 2nd place - AntiPPP (1,000,000 KRW)
    • UTC-CTF Teaser 2019 1st place - Defenit
    • CCE Final 2019 10th place - Defenit
    • SECCON Online CTF 2019 10th place - SEDefenit
    • Rooters CTF 2019 1st place - Defenit
    • CCE Quals 2019 10th place - Defenit
    • Holy Shield CTF 2019 2nd place - Defenit (300,000 KRW)
    • SSTF Open CTF 2019 2nd place - Defenit (Samsung Galaxy S10)
    • SUA CTF 2019 2nd place - Defenit
    • 20th Hackingcamp Best Hacker
    • 19th Hackingcamp Sincere Hacker