Hubert Ritzdorf

@HRitzdorf

@chain_security

Zurich, Switzerland

Joined November 2017

Hubert Ritzdorf
@HRitzdorf
Nov 10, 2023
New Ethereum hardfork. New attack vector. That's why security work never becomes dull. 😉 Read the great analysis by @k_besic from our team to make sure you know what's coming.
ChainSecurity
@chain_security
Nov 10, 2023
A new and exciting feature, transient storage, will be added to the EVM in the upcoming Cancun hardfork. Our team’s investigation of EIP-1153 has unveiled a new and unexpected reentrancy attack vector for new smart contracts. We’re sharing our findings. 🧵 chainsecurity.com/tstore-low-gas…
Hubert Ritzdorf
@HRitzdorf
Apr 4, 2022
Credit to the fuse team for the quick reaction and the super positive interaction. Otherwise, praise to the one, the only, he protects your contracts when you're sleeping and wakes you with "u up?": @samczsun Was an honor working with him, @YSmaragdakis from @dedaub and others.
Jack Longarzo
@JackLongarzo
Apr 1, 2022
Recently security researchers including @samczsun @HRitzdorf, and @YSmaragdakis identified a vulnerability in the Fuse codebase. Immediate action was taken and no funds were lost. This article summarizes the incident and how Rari Capital is moving forward. medium.com/@JackLongarzo/…
Hubert Ritzdorf
@HRitzdorf
Mar 29, 2022
PSA: Rugpull for the following Polygon contracts: polygonscan.com/address/0x47c7… polygonscan.com/address/0x86f9… These are related to: starchi.gg All funds staked in those contracts will be lost. So please do not stake more.
Hubert Ritzdorf
@HRitzdorf
Apr 7, 2021
Thanks a lot to @samczsun and @paradigm_ctf for the awesome challenges. Really had a great time and learned a lot. Your dedication to improving the ecosystem is extremely appreciated.
samczsun
@samczsun
Apr 7, 2021
It finally happened! Congrats to @HRitzdorf and @a_permenev for solving the infamous 'swap' challenge from @paradigm_ctf. Official write-up and solutions will be posted in a few days so now's your chance to give it one last shot! github.com/paradigm-opera…
Hubert Ritzdorf
@HRitzdorf
Jan 29, 2021
Solidity: uint128 b = .. uint256 x = uint256(b); uint256 y; assembly{ y := b } x == y? Sometimes... not. We are documenting a little known Solidity functionality and its changes in 0.8.0. TL;DR More ways to mess up in assembly. pwc.ch/en/insights/di…