Welcome to the resource topic for 2020/492
Title:
UC Non-Interactive, Proactive, Threshold ECDSA
Authors: Ran Canetti, Nikolaos Makriyannis, Udi Peled
Abstract:Building on the Gennaro & Goldfeder and Lindell & Nof protocols (CCS ’18), we present a threshold ECDSA protocol, for any number of signatories and any threshold, that improves as follows over the state of the art: * Signature generation takes only 4 rounds (down from the current 8 rounds), with a comparable computational cost. Furthermore, 3 of these rounds can take place in a preprocessing stage before the signed message is known, lending to a non-interactive threshold ECDSA protocol. * The protocol withstands adaptive corruption of signatories. Furthermore, it includes a periodic refresh mechanism and offers full proactive security. * The protocol realizes an ideal threshold signature functionality within the UC framework, in the global random oracle model, assuming Strong RSA, semantic security of the Paillier encryption, and a somewhat enhanced variant of existential unforgeability of ECDSA. These properties (low latency, compatibility with cold-wallet architectures, proactive security, and composable security) make the protocol ideal for threshold wallets for ECDSA-based cryptocurrencies.
ePrint: https://eprint.iacr.org/2020/492
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