We prove adaptive security of a simple three-round threshold Schnorr signature scheme,
which we call Sparkle. The standard notion of security for threshold signatures considers a …

Multi-signatures enable a group of signers to produce a joint signature on a joint message.
Recently, Drijvers et al.(S&P'19) showed that all thus far proposed two-round multi-signature …

Unlike signatures in a single-party setting, threshold signatures require cooperation among
a threshold number of signers each holding a share of a common private key. Consequently …

Multi-signatures are protocols that allow a group of signers to jointly produce a single
signature on the same message. In recent years, a number of practical multi-signature …

The Schnorr blind signing protocol allows blind issuing of Schnorr signatures, one of the
most widely used signatures. Despite its practical relevance, its security analysis is …

Payment Channel Hub (PCH) is a promising solution to the scalability issue of first-
generation blockchains or cryptocurrencies such as Bitcoin. It supports off-chain payments …

Both threshold and blind signatures have, individually, received a considerable amount of
attention. However little is known about their combination, ie, a threshold signature which is …

Threshold digital signatures enable a distributed execution of signature functionalities and
will play a crucial role in the security of emerging decentralized next-generation networked …

Blind signatures, proposed by Chaum (CRYPTO'82), are interactive protocols between a
signer and a user, where a user can obtain a signature without revealing the message to be …

In a multiparty signing protocol, also known as a threshold signature scheme, the private
signing key is shared amongst a set of parties and only a quorum of those parties can …