Indisputable GDPR compliant signatures in ContractChain

Nowadays, entering into a contract with an overseas company still relies on postal services to send a printed contract, which is signed on paper. Lizard Global is developing an online platform for constructing, reviewing and signing digital contracts for one of their clients. In the original system, when a signee signed a contract, his personal...

Consecutive Delegatable Signing Rights for the Issuance of Anonymous Attribute-Based Credentials

Digital identities and credentials are gradually replacing physical documents, as they can be verified with more accuracy and efficiency. Since online privacy is becoming more crucial than ever, it is essential to preserve the privacy of individuals whenever possible. Therefore, anonymous attestation of digital credentials should be feasible,...

Privacy-Preserving Combinatorial Set Operations for Cyber Threat Intelligence

In less than a century, the Internet has morphed from being a communication channel to a medium of existence for people. Meanwhile, attacks over the Internet have been growing both qualitatively and quantitatively, with losses transcending the financial kind and threatening the well-being of human lives. This trend fuels the need for Cyber...

A Distributed Public Key Infrastructure for the IoT

The role of Internet of Things (IoT) devices is becoming larger in our day-to-day life. More and more, devices are used to help with simple tasks in our lives. Little computers are installed in a large variety of consumer products and are often connected to the internet. The large increase of these “resource-constrained” devices that are...

Towards Decentralized Grids: EnergyBazaar: decentralized free-market energy-trade within an isolated community micro-grid

<br/>We witness the rise of prosumers: consumers that produce a surplus of energy that can be sup- plied back into the grid. However, for energy-trade between prosumers and consumers, a cen- tralized and undesirable middle-man is still necessary. We developed a method to decentralize essential aspects of energy distribution between households....

DECOUPLES: A Privacy-Preserving Solution for Traceability in Supply Chains

Traceability is an increasingly important aspect of the supply chain with several highlights throughout the last few decades. Parties, such as consumers and government agencies, have shown an increase in demand for information regarding their products and materials. Studies throughout the last few years have proposed approaches for a...

Constructing a Confidential, Authenticated, Forward Secure and Offline Logging Scheme

In IT systems, a logfile provides administrators with an audit trail which can be used to review a system’s activities and a way to discover and diagnose problems which have occurred within that system. When an attacker penetrates an IT system, commonly one of their first actions is tampering with the logs, so that they can hide their malicious...

Privacy-Preserving Data Aggregation in Peer-to-Peer Network: A Multiparty Computation Approach

Current interconnected society provides us with numerous devices communicating with one another. Exchange of data thus become an integral part in our live. Data become valuable commodity in today's setting because of their usage by individual and other interested parties. Several parties may be interested in computing a function over their data...

Enhancing Privacy in Smart Home Ecosystems Using Cryptographic Primitives and a Decentralized Cloud Entity

Within the phenomenon known as the Internet of Things (IoT), an enormous growth is taking place. IoT systems exist in different ways, ranging from industrial applications to user focused systems. A specific subset of a user-focused IoT system is found as Smart Home environments. At Smart Homes, themultiple Smart Objects or Smart Devices are...