CSI-SharK: CSI-FiSh with Sharing-friendly Keys

ePrint Report: CSI-SharK: CSI-FiSh with Sharing-friendly Keys

Shahla Atapoor, Karim Baghery, Daniele Cozzo, Robi Pedersen

CSI-FiSh is one of the most efficient isogeny-based signature schemes, which is proven to be secure in the Quantum Random Oracle Model (QROM). However, there is a bottleneck in CSI-FiSh in the threshold setting, which is that its public key needs to be generated by using $k-1$ secret keys. This leads to very inefficient threshold key generation protocols and also forces the parties to store …

eprint report keys sharing shark