About
Hi there 👋
I'm Jonathan Sebastian Marbun, a passionate and enthusiastic person in the field of Cyber Security, especially in Digital Forensics.
Currently active playing CTF with SNI Cybersecurity Team and pursuing a Bachelor of Applied Computer degree in National Cyber and Crypto Polytechnic. Now, being a core member and a mentor for National Cyber and Crypto Polytechnic CTF teams, visit Sanapati Cyberstorm.
Sometimes I actively conduct research related to Digital Forensics and create CTF problems for various CTF events.
Achievements
| Event | Achievement | Organizer |
|---|---|---|
| FindIT CTF - 2024 | Finalist | Gadjah Mada University |
| DSTA CDDC Brainhack - 2024 | Finalist | Defense Science and Technology Agency, Singapore |
| Hacktheon Sejong - 2024 | Honorable Mention III | Sejong City Hall, South Korea |
| Nullcon HackIM Berlin CTF - 2024 | 3rd Place | NullCon |
| Space Heroes CTF - 2024 | 2nd Place | FITSEC |
| KMIPN VI Cyber Security Category - 2024 | 1st Place | BAKORMA |
| Technofair 11 CTF - 2024 | Finalist | Gunadarma University |
| IT Today HackToday CTF - 2024 | Finalist | IPB University |
| Gemastik XVII Cyber Security Category - 2024 | Finalist | Puspresnas |
| Blackhat MEA CTF - 2024 | Finalist | Blackhat MEA, Saudi Arabia |
| Informatics Fest CTF - 2024 | 3rd Place | Padjajaran University |
| COMPFEST 16 CTF - 2024 | 1st Place | University of Indonesia |
| Cyber Jawara International - 2024 | 1st Place | CSIRT.id & IdNSA |
| Interfest CTF - 2024 | Finalist | Telkom University |
| Backdoor CTF - 2024 | 1st Place | InfoSecIITR |
| ARA 6.0 CTF - 2025 | Finalist | Sepuluh Nopember Institute of Technology |
| TAMUctf (Open Division) - 2025 | 1st Place | Texas A&M University |
Experiences
| Event | Organizer | Experience |
|---|---|---|
| Wreck IT 5.0 | National Cyber and Crypto Polytechnic | Challenge Author, Head of Organizer |
| Cyber Specter's Cyber Hunt 2024 | Cyber Specters | Challenge Author |
| Sanapati Cyberhunt 2024 | National Cyber and Crypto Polytechnic | Challenge Author, Organizer |
| Cyber Ops Clash 2024 | Meta4Sec & Cyber Specters | Challenge Author |
| IT-Del CTF 2024 | Del Institute of Technology | Challenge Author, Infrastructure |
| SNI CTF 2024 | SNI Cybersecurity Team | Challenge Author, Head of Organizer |
| Cyber Sentrix 2024 | Cyber Specters | Challenge Author |
| Sanapati Cyberhunt 2025 | National Cyber and Crypto Polytechnic | Challenge Author, Organizer |
| Cyber Jawara National 2024 | CSIRT.id, IdNSA, SKSD | Challenge Author (Final Round) |