Quantum cryptography exploits principles of quantum physics for the secure processing of
information. A prominent example is secure communication, ie, the task of transmitting …

Along with the rapid development and wide application of information technology, human
society has entered the information era. In this era, people live and work in cyberspace …

Many organizations need large amounts of high quality data for their applications, and one
way to acquire such data is to combine datasets from multiple parties. Since these …

Classical results on secure multi-party computation (MPC) imply that fully secure
computation, including fairness (either all parties get output or none) and robustness (output …

Threshold ECDSA signatures have received much attention in recent years due to the
widespread use of ECDSA in cryptocurrencies. While various protocols now exist that admit …

Bitcoin and other cryptocurrencies have recently introduced support for Schnorr signatures
whose cleaner algebraic structure, as compared to ECDSA, allows for simpler and more …

Abstract We present UnTraceable Transactions (UTT), a system for decentralized ecash with
accountable privacy. UTT is the first ecash system that obtains three critical properties:(1) it …

Distributed key generation (DKG) protocols are an essential building block for threshold
cryptosystems. Many DKG protocols tolerate up to ts< n/2 corruptions assuming a well …

Cheater identification in secure multi-party computation (MPC) allows the honest parties to
agree upon the identity of a cheating party, in case the protocol aborts. In the context of a …

Time-based primitives like time-lock puzzles (TLP) are finding widespread use in practical
protocols, partially due to the surge of interest in the blockchain space where TLPs and …