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Achievements

Achievement: Pair Extraordinairex4Achievement: Starstruckx3Achievement: Pull Sharkx4Achievement: QuickdrawAchievement: 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, AI, Fuzzing, Formal Verification, Microkernel, Cryptography, Zero Knowledge Proof, Rust, Lean4

🚀 Featured Projects

Project Description Stars
h5i Secure, auditable browser for AI agents GitHub stars
AIJack Security risk simulator for machine learning (10K+ downloads, referenced in 10+ papers) GitHub stars
zkFuzz ZK circuit fuzzer (IEEE S&P'26, 60+ confirmed bugs) GitHub stars
MyZKP Tutorial e-book to implement zero-knowledge proofs from scratch using Rust and CUDA. GitHub stars

📄 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. h5i-dev/h5i h5i-dev/h5i Public

    Fast, security-first headless browser for AI agents. Built for automation, red teaming, web testing, and scraping, with direct HTTP traffic control and auditable sessions. Pure Rust, no Chromium or…

    Rust 629 62

  2. AIJack AIJack Public

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

    C++ 430 66

  3. h5i-dev/senv h5i-dev/senv Public

    Sandboxed Python environments with the uv workflow. Registry-only installs, read-only dependencies, and deny-by-default networking. Local-first. No SaaS account required.

    Rust 43 5

  4. zkFuzz zkFuzz Public

    ZK Circuit Fuzzer (IEEE S&P'26)

    Rust 45 4

  5. h5i-dev/awesome-ai-agent-incidents h5i-dev/awesome-ai-agent-incidents Public

    A curated corpus of incidents, attack vectors, failure modes, and defensive tools for autonomous AI agents.

    48 9

  6. MyZKP MyZKP Public

    Building Zero Knowledge Proof from Scratch in Rust

    Rust 54 2