ECDSA is a standardized signing algorithm that is widely used in TLS, code signing,
cryptocurrency and more. Due to its importance, the problem of securely computing ECDSA …

ECDSA is a standard digital signature schemes that is widely used in TLS, Bitcoin and
elsewhere. Unlike other schemes like RSA, Schnorr signatures and more, it is particularly …

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 …

Universal composability (aka UC security) provides very strong security guarantees for
protocols that run in complex real-world environments. In particular, security is guaranteed to …

Quasi-adaptive non-interactive zero-knowledge (QA-NIZK) proofs is a recent paradigm,
suggested by Jutla and Roy (Asiacrypt'13), which is motivated by the Groth-Sahai seminal …

Secure aggregation becomes a major solution to providing privacy for federated learning.
Secure aggregation for mobile devices typically relies on Shamir secret sharing (SSS) to …

Outsourced decryption attribute-based encryption (OD-ABE) is emerging as a promising
cryptographic tool to provide efficient fine-grained access control for data accessing and …

We construct the first UC commitment scheme for binary strings with the optimal properties of
rate approaching 1 and linear time complexity (in the amortised sense, using a small …

We consider reputation systems in the Universal Composability Framework where users can
anonymously rate each others products that they purchased previously. To obtain …

We present a new constant round additively homomorphic commitment scheme with
(amortized) computational and communication complexity linear in the size of the string …