Sihoon Lee

Web3 Security Researcher / Retired reverser / prev. @kalos_security, @theori_io

[Sihoon Lee @push0ebp]

The AI wasn't fully autonomous in this case, but when guided step by step with better ideas, it consistently discovered better solutions.

[Sihoon Lee @push0ebp]

Got 1st place in defcon quals. It's time to accept the power of AI.
While I was grinding on shellcode minimization, my teammate's AI found better solutions. Once I accepted that and started guiding the AI, it eventually found the best score.

[Robert Chen @NotDeGhost]

see everyone in vegas!

thanks to Claudio for carrying me

[Sihoon Lee @push0ebp]

In optimization-heavy competitions like KOTH, which push us beyond human limits and require intuition and creativity, I used to believe that humans could still outperform AI.
I got beaten by AI.

[Zellic @zellic_io]

The core utilities that run every Linux system have been rewritten in Rust. We audited them.

Before shipping uutils coreutils with Ubuntu 26.04, @Canonical commissioned Zellic for an external security audit.

Two rounds, fixes contributed directly upstream.

Full report below.

[Sihoon Lee @push0ebp]

@ustas_eth Hey, thank you! I think it's time to retire 😂

[Sihoon Lee @push0ebp]

2nd place again.
I was totally cooked😭

[KimchiPremium @Web3Kimchi]

Proud to announce that PremiumKimchi team secured 2nd place at @Wonderland CTF 2026!
Huge thanks to the Wonderland team, all sponsors, and my amazing teammates for the great competition #WonderlandCTF #Web3Security #CTF

@push0ebp @_nd_koo @snwo_kr @jinmo123 @lj1nu

[Sihoon Lee @push0ebp]

@Web3Kimchi @Wonderland @_nd_koo @snwo_kr @jinmo123 @lj1nu This is AI-generated by jinu 😅

[Sihoon Lee @push0ebp]

GG with 2nd place. Thanks for organizing @wonderland!

[Wonderland @Wonderland]

The Wonderland CTF was a blast!

Huge congrats to all the teams, especially “STACK TOO DEEP”, “NADA ESPECIAL” and “SECSEE”.

Oh, also: https://t.co/WHMt1f36Mk 👉👈

[Sihoon Lee @push0ebp]

Huge thanks to @SEAL_911 for helping with the analysis.

[Sihoon Lee @push0ebp]

If you've ever used @LineaBuild bridge on @okx Web3, Make sure to REVOKE approvals immediately on https://t.co/N8HibsHrkd. The contracts are 0xd19d4B5d358258f05D7B411E21A1460D11B0876F on Ethereum, 0x508ca82df566dcd1b0de8296e70a96332cd644ec on Linea.

[Sihoon Lee @push0ebp]

When I queried approvals on-chain, there are many victims on Ethereum, but only few victims on Linea.

[Sihoon Lee @push0ebp]

GG. Enjoyed 3rd place again at this year's DEFCON CTF! Thanks to @SuperDiceCode.

[DiceGang @dicegangctf]

We came 3rd at this year's DEFCON CTF Finals as @SuperDiceCode!

Thanks to @SuperGuesser , CodeRed, and @SquidProxyLover for playing with us, and @Nautilus_CTF for organising.