Efficient Asymmetric Threshold ECDSA for MPC-based Cold Storage

ePrint Report: Efficient Asymmetric Threshold ECDSA for MPC-based Cold Storage

Constantin Blokh, Nikolaos Makriyannis, Udi Peled

Motivated by applications to cold-storage solutions for ECDSA-based cryptocurrencies, we present a new ECDSA protocol between $n$ ``online'' parties and a single ``offline'' party. Our protocol tolerates all-but-one adaptive corruptions, and it achieves full proactive security. Our protocol improves as follows over the state of the art.


** The preprocessing phase for calculating preprocessed data for future signatures is lightweight and non-interactive; it consists …

ecdsa eprint report storage