DongHyeon Hwang (kind_killerwhale)

Security Researcher at the Ethereum Foundation

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I am a Blockchain Security Researcher with expertise in Fuzzer Development and Reverse Engineering.

Research & Projects

🔹 Current Research [Fractal] [PRIVATE]

SSZ Differential Fuzzer

🔹 Side Project [ Geth ABI Fuzzer ] [PRIVATE]

Semantic-aware ABI fuzzer using libFuzzer + custom Go/C++ mutators.
Implements differential fuzzing between Geth and ethers.js ABI encoders/decoders.

Past Projects

🔸 [karalabe/ssz fuzzer] [PUBLIC]

High-efficiency SSZ fuzzer with custom optimization. Used in fastssz vs karalabe differential testing.

🔸 [Varus] [PRIVATE]

LLM Based WASM LLVM libfuzzer with Custom Semantic Mutator

WASM fuzzing tool leveraging LLM capabilities for semantic mutation strategies.

🔸 [Talon] [PRIVATE]

Geth EVM Fuzzer Development

Talon combines LLVM libFuzzer with a custom mutator (written in C++), gofuzz-shim (tying Go fuzz callbacks to libFuzzer), and a Docker setup that bundles multiple EVM implementations (Go Ethereum, Erigon, evmone, Nethermind, Besu, etc.) for diff fuzzing. In other words, it allows one to fuzz EVM scenarios (blocks/transactions) while cross-checking different EVM engines.

Featured

🔹 Ethereum Blog: Allocation Q4 2024

Connect

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