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publications
FAEST: algorithm specifications
Technical report, National Institute of Standards and Technology, 2023
This document describes and specifies the FAEST digital signature algorithm. It presents the underlying cryptographic components and specifies the building blocks used to construct the FAEST algorithm…..
Towards Private Deep Learning-Based Side-Channel Analysis Using Homomorphic Encryption
Constructive Side-Channel Analysis and Secure Design. COSADE 2024, (Gardanne, Aix-Marseille, France), 2024
This work investigates using Homomorphic Encryption (HE) to assist the security evaluation of cryptographic devices without revealing side-channel information. For the first time….
Hiding Your Awful Online Choices Made More Efficient and Secure: A New Privacy-Aware Recommender System
IFIP Advances in Information and Communication Technology, (Edinburgh, Scotland), 2024
Recommender systems are an integral part of online platforms that recommend new content to users with similar interests. However, they demand a considerable amount of user activity data….
One Tree to Rule Them All: Optimizing GGM Trees and OWFs for Post-Quantum Signatures
Advances in Cryptology – ASIACRYPT 2024, (Kolkata, India), 2024
The use of MPC-in-the-Head (MPCitH)-based zero-knowledge proofs of knowledge (ZKPoK) to prove knowledge of a preimage of a one-way function (OWF) is a popular approach towards constructing efficient post-quantum….
FAEST v2: Algorithm Specifications
Technical report, National Institute of Standards and Technology, 2025
This document describes and specifies version 2 of the FAEST digital signature algorithm. It presents the underlying cryptographic components and specifies the building blocks used to construct the FAEST algorithm….
Shorter, Tighter, FAESTer: Optimizations and Improved (QROM) Analysis for VOLE-in-the-Head Signatures
Advances in Cryptology - CRYPTO 2025, (Santa Barbara, CA, USA), 2025
In the past decade and largely in response to the NIST standardization effort for post-quantum cryptography, many new designs for digital signatures have been proposed. Among those….
Cache Timing Leakages in Zero-Knowledge Protocols
Advances in Financial Technologies (AFT 2025) (Pittsburgh, USA), 2025
The area of modern zero-knowledge proof systems has seen a significant rise in popularity over the last couple of years, with new techniques and optimized constructions emerging on a regular basis….
Schmivitz: VOLEitH based ZK gadgets for threshold cryptography
“Preview Writeup”: In anticipation of a package submission to the NIST Threshold Call, 2026
his preview writeup represents a plan to submit Schmivitz to the NIST Threshold Call. Schmivitz is a Vector Oblivious Linear Evaluation in the Head (VOLEitH) Zero-Knowledge (ZK) system that includes two gadgets, Weak VOLEs and VOLEitH, which can be used as building blocks for cryptographic applications such as threshold signature and encryption schemes….
Concretely Efficient Blind Signatures Based on VOLE-in-the-Head Proofs and the MAYO Trapdoor
Accepted at USENIX 2026 (Baltimore, USA), 2026
Blind signatures (Chaum, CRYPTO 82) are important building blocks in many privacy-preserving applications, such as anonymous credentials or e-cash schemes. Recent years saw a strong interest….
RainHash2.0: Hardware- and Arithmetization-friendly Hash Function
Accepted at CHES 2026 (Antalya, Türkiye), 2026
Zero-knowledge (ZK) proof systems have developed rapidly in recent years, with hash functions as one of their central building blocks. Since these often dominate the prover cost, circuit-friendly hash function….
talks
Concretely Efficient Blind Signatures Based on VOLE-in-the-Head Proofs and the MAYO Trapdoor
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teaching
Privacy Enhancing Technologies 22/23/24/25
Master's Lecture Exercise, Graz University of Technology, 2025
Privacy Enhancing Technologies 23/24/25
Master's Lecture, Graz University of Technology, 2025
Modern Public Key Cryptography 24/26
Master's Lecture, Graz University of Technology, 2026