Marek Sýs

Minerva: The curse of ECDSA nonces

2020 · IACR Transactions on Cryptographic Hardware and Embedded Systems

We present our discovery of a group of side-channel vulnerabilities in implementations of the ECDSA signature algorithm in a widely used Atmel AT90SC FIPS 140-2 certified smartcard chip and five cryptographic libraries (libgcrypt, wolfSSL, MatrixSSL, …

CoolTest: Randomness test suited for small data volumes

2026 · Computers & Security

In this work, we present CoolTest, a randomness test well-suited for scenarios with only small volumes of data. CoolTest searches for a correlation among any k bits within a fixed-size window. CoolTest generalizes BoolTest (ICETE’17) …