After the success of the Bitcoin blockchain, came several cryptocurrencies and blockchain
solutions in the last decade. Nonetheless, Blockchain-based systems still suffer from low …

Data confidentiality is a central concern in modern computer systems and services, as
sensitive data from users and companies are being increasingly delegated to such systems …

Blockchains have the potential to revolutionize markets and services. However, they
currently exhibit high latencies and fail to handle transaction loads comparable to those …

Central banks around the world are exploring and in some cases even piloting Central Bank
Digital Currencies (CBDCs). CBDCs promise to realize a broad range of new capabilities …

Due to the popularity of blockchain-based cryptocurrencies, the increasing digitalization of
payments, and the constantly reducing role of cash in society, central banks have shown an …

Consider a cloud server that owns a key-value store and provides a private query service to
its clients. Preserving client privacy in this setting is difficult because the key-value store is …

Anonymous message delivery systems, such as private messaging services and privacy-
preserving payment systems, need a mechanism for recipients to retrieve the messages …

Ledger systems are applications run on peer-to-peer networks that provide strong integrity
guarantees. However, these systems often have high participation costs. For a server to join …

Trusted Execution Environments (TEEs) are a feature of modern central processing units
(CPUs) that aim to provide a high assurance, isolated environment in which to run …

Private messaging systems that use a bulletin board, like privacy-preserving blockchains,
have been a popular topic during the last couple of years. In these systems, typically a …