Publications

Threshold signatures improve both availability and security of digital signatures by splitting the signing key into N shares handed out to different parties.

This paper presents Raccoon, a lattice-based signature scheme submitted to the NIST 2022 call for additional post-quantum signatures.

The main purpose of this work is to raise awareness about a primitive that can provide large efficiency gains in post-quantum cryptography: multi-recipient KEMs, ormKEMs.

In this work, we assess the real-world practicality of CSIDH, an isogeny-based non-interactive key exchange.

In this work, we present two round-optimal blind signatures under standard assumptions in the ROM with different approaches: one achieves the smallest sum of the signature and communication sizes, while the other achieves the smallest signature size.

In this paper, we introduce a novel trapdoor generation technique for Prest's hybrid sampler over NTRU lattices.

In this paper, we show that Peregrine, one of the candidates in the ongoing Korean post-quantum cryptography competition, is no exception, by demonstrating a practical key recovery attack against it.

We present distributed key generation and decryption protocols for an additively homomorphic cryptosystem based on class groups, improving on a similar system proposed by Braun, Damgård, and Orlandi at CRYPTO '23.

In this work, we introduce mask compression. This conceptually simple technique is based on standard, non-masked symmetric cryptography.

The Signal protocol is a secure instant messaging protocol that underlies the security of numerous applications such as WhatsApp, Skype, Facebook Messenger among many others.

In this work, we provide a simple and novel attack on blind signatures based on identification protocols performing parallel repetition to reduce the soundness error.

Yesterday NIST published their finalized post-quantum cryptography (PQC) standards. This paper discusses the standards in more detail and what comes next.