I study new attack techniques against computer architecture and system software, and how the search for them can be automated.

I am a high school student at Rikkyo Niiza and a part-time security researcher at Ricerca Security, Inc., where I work on binary analysis and fuzzing. I also sit on the organizing committee of SECCON Beginners and author pwn challenges for its CTF.

Highlights

  • CSS Outstanding Paper Award

    Computer Security Symposium 2025 — 13 of 270+ papers, youngest recipient to date

  • Best Poster Presentation Award

    IPSJ 88th National Convention, 2026

  • Four peer-reviewed publications

    Workshops at NDSS, ICSE and EuroS&P 2026, plus a poster at IEEE S&P 2026

  • Registered Information Security Specialist

    Passed at the youngest age on record, 2023

Research

Read about the research

Selected Publications

  1. DeMeSSAI@ EuroS&P '26July 2026

    How Far Can LLM Agents Go in Binary Exploitation? A CTF-Based Evaluation

    Ryutaro Nishizaka, Yudai Fujiwara, Yuichi Sugiyama

    5th International Workshop on Designing and Measuring Security in Systems with AI, co-located with EuroS&P 2026

  2. IEEE S&P '26Poster SessionMay 2026

    Poster: Where Do LLM Agents Fail in Binary Exploitation?

    Yudai Fujiwara, Ryutaro Nishizaka, Yuichi Sugiyama

    47th IEEE Symposium on Security and Privacy

    PDF

  3. SBFT@ ICSE '26April 2026

    IPSM-Based Test Case Minimization for Network Protocol Implementations

    Ryutaro Nishizaka, Kazushi Kato, Yuichi Sugiyama

    19th International Workshop on Search-Based and Fuzz Testing (SBFT), co-located with ICSE 2026

    doi:10.1145/3786155.3788580

  4. BAR@ NDSS '26February 2026

    Towards LLM-Resistant Software Protection: Agent Failure Patterns in CTF Reverse Engineering

    Ryutaro Nishizaka, Yudai Fujiwara, Takuya Shimizu, Kazushi Kato, Yuichi Sugiyama

    Workshop on Binary Analysis Research (BAR) 2026, co-located with NDSS Symposium 2026

All publications

Recent Activities

2026

  • Masason Foundation33 selected nationwide

    Selected for the 10th cohort, open to ages 10 to 20.

  • IPSJ 88th National Convention

    Received the Best Poster Presentation Award.

  • BAR 2026

    Presented a first-author paper at the Workshop on Binary Analysis Research, co-located with NDSS 2026.

    • Towards LLM-Resistant Software Protection: Agent Failure Patterns in CTF Reverse Engineering

  • SBFT 2026

    Presented a first-author paper at the International Workshop on Search-Based and Fuzz Testing, co-located with ICSE 2026.

    • IPSM-Based Test Case Minimization for Network Protocol Implementations

  • DeMeSSAI 2026

    Presented a first-author paper at the International Workshop on Designing and Measuring Security in Systems with AI, co-located with EuroS&P 2026.

    • How Far Can LLM Agents Go in Binary Exploitation? A CTF-Based Evaluation

Full CV