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Achievement: Pair ExtraordinaireAchievement: QuickdrawAchievement: Starstruckx2Achievement: Pull Sharkx3Achievement: YOLO

Achievements

Achievement: Pair ExtraordinaireAchievement: QuickdrawAchievement: Starstruckx2Achievement: Pull Sharkx3Achievement: YOLO

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Koukyosyumei/README.md

Hideaki Takahashi 🌍

I’m a Ph.D. student in Computer Science at Columbia University working on software security, cryptography, and agentic systems.

Keywords: Software Testing, Fuzzing, Formal Verification, AI, Agent, Cryptography, Zero Knowledge Proof, Rust, Lean4

🚀 Featured Projects

zkFuzz ZK circuit fuzzer (IEEE S&P'26, 60+ confirmed bugs)
Runwai Refinement-typed DSL for certified AIR constraints and lookups implemented in Lean4
MyZKP Tutorial e-book to implement zero-knowledge proofs from scratch using Rust and CUDA.
AIJack Security risk simulator for machine learning (400+ stars on GitHub, 10K+ downloads, referenced in 10+ papers)
h5i Next-Gen AI-Aware Git

📄 Selected Publications

  • [IEEE S&P '26] 0️⃣: zkFuzz: Foundation and Framework for Effective Fuzzing of Zero-Knowledge Circuits
    • Hideaki Takahashi, Jihwan Kim, Suman Jana, Junfeng Yang | paper | code
  • [AAMAS '24] 🚗: On the Transit Obfuscation Problem
    • Hideaki Takahashi, Alex Fukunaga | paper | code
  • [ICLR '24] 🌳: VFLAIR: Benchmark for Vertical Federated Learning
    • Tianyuan Zou, Zixuan Gu, Yu He, Hideaki Takahashi, Yang Liu, Ya-Qin Zhang | paper | code
  • [CVPR '23] 🎥: Breaching FedMD, Image Recovery via Paired-Logits Inversion Attack
    • Hideaki Takahashi, Jingjing Liu, and Yang Liu | paper | code

🐛 Selected Security Findings

AI Agent / MCP servers

Cryptography / Zero-Knowledge Proof

✍️ Pinned Blog Posts

  • Formal Verification of Blockchain Consensus Algorithms in Lean 4 | blog | code
  • Learning x86–64 Machine Language and Assembly by Implementing a Disassembler | blog | code

Pinned Loading

  1. zkFuzz zkFuzz Public

    ZK Circuit Fuzzer (IEEE S&P'26)

    Rust 40 4

  2. AIJack AIJack Public

    Security and Privacy Risk Simulator for Machine Learning (arXiv:2312.17667)

    C++ 424 67

  3. MyZKP MyZKP Public

    Building Zero Knowledge Proof from Scratch in Rust

    Rust 51 2

  4. FLAIR-THU/PairedLogitsInversion FLAIR-THU/PairedLogitsInversion Public

    Implementation of "Breaching FedMD: Image Recovery via Paired-Logits Inversion Attack" (CVPR 2023)

    Python 6

  5. Runwai Runwai Public

    COMS 6998 (Fall 2025): Refinement-typed DSL for certified AIR constraints and lookups

    Lean 6 3

  6. h5i-dev/h5i h5i-dev/h5i Public

    Next-Gen AI-Aware Git

    Rust 19 5