Roman Walch
Roman Walch
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Talks
2025
Scaling Private Iris Code Uniqueness Checks to Millions of Users
Mar 25, 2025
RWMPC 2025
Slides
2024
Private Shared State with CoSNARKs: Noir meets MPC
In this talk, we’ll dive into the world of collaborative SNARKs—what they are, the unique challenges they tackle, and what they are …
Nov 11, 2024
Devcon 7 - Bangkok
Slides
Collaborative SNARKs - Co-Circom
In this talk we present collaborative SNARKs and why they are needed. Furthermore, we present our co-circom library, a rust library …
Jul 24, 2024
Privacy & Scaling Exploration Residency Tokyo
Slides
Scaling Private Iris Code Uniqueness Checks to Millions of Users
In this work we tackle privacy concerns in biometric verification systems that typically require server-side processing of sensitive …
Jul 23, 2024
Privacy & Scaling Exploration Residency Tokyo
Slides
Scaling Private Iris Code Uniqueness Checks to Millions of Users
In this work we tackle privacy concerns in biometric verification systems that typically require server-side processing of sensitive …
Jun 12, 2024
Privacy & Scaling Exploration
Slides
Video
Scaling Private Iris Code Uniqueness Checks to Millions of Users
Jun 5, 2024
TPMPC 2024 Rump Session
Slides
Large-Scale MPC: Decentralized Iris Code Membership
Proof of Personhood is one of the core ideas behind the Worldcoin project. An integral part of this proof is the biometric uniqueness …
Feb 27, 2024
D/Infra Summit -- Denver, USA
Slides
2023
Hash Functions Monolith for ZK Applications: May the Speed of SHA-3 be With You
The rising popularity of computational integrity protocols has led to an increased focus on efficient domain-specific hash functions, …
Sep 20, 2023
ZK Summit 10 -- London, UK
Slides
Pasta: A Case for Hybrid Homomorphic Encryption
The idea of hybrid homomorphic encryption (HHE) is to drastically reduce bandwidth requirements when using homomorphic encryption (HE) …
Sep 12, 2023
CHES 2023 -- Prague, Czech Republic
Slides
From Farfalle to Megafono via Ciminion: The PRF Hydra for MPC Applications
The area of multi-party computation (MPC) has recently increased in popularity and number of use cases. At the current state of the …
Apr 25, 2023
Eurocrypt 2023 -- Lyon, France
Slides
RCp: Fast Arithmetization-Friendly Hashing
Apr 23, 2023
Permutation-Based Crypto 2023 -- Lyon, France
Slides
2022
Privately Connecting Mobility to Infectious Diseases via Applied Cryptography
Recent work has shown that cell phone mobility data has the unique potential to create accurate models for human mobility and …
Jul 12, 2022
PETS 2022 -- Sydney, Australia and Online
Slides
Pasta: A Case for Hybrid Homomorphic Encryption
May 29, 2022
FHE.org 2022 -- Trondheim, Norway
Slides
2021
Multi-Party Revocation in Sovrin: Performance through Distributed Trust
Accumulators provide compact representations of large sets and compact membership witnesses. Besides constant-size witnesses, …
May 20, 2021
CT-RSA 2021 -- Virtual Event
Slides
2020
Open Source Framework for Hybrid Homomorphic Encryption
Nov 11, 2020
FSE 2020 Rump Session
Slides
Video
Privacy-Preserving Analytics: Cryptography
Oct 7, 2020
Know-Center Summer Academy 2020
Slides
Efficient FPGA Implementations of LowMC and Picnic
Post-quantum cryptography has received increased attention in recent years, in particular, due to the standardization effort by NIST. …
Feb 27, 2020
CT-RSA 2020 -- Moscone Center, SF, USA
Slides
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