Block and Mortar: A blockchain-inspired business model for mortgage funding market place

Digital Voting Pass: One step towards the digitalization of the entire voting process

The Dutch electoral voting system is designed in a way that does not fit in the current era of the digital transformation. Almost every procedure during the elections is done manually and change in policy is very difficult as it requires a change in legislation.<br/>This thesis explores a more trustworthy, transparent and less expensive way of...

A Blockchain Consensus Protocol With Horizontal Scalability

Blockchain systems have the potential to decentralise many traditionally centralised systems. However, scalability remains a key challenge. Without a horizontally scalable solution, where performance increases by adding more nodes to the system, blockchain systems remain unsuitable for ubiquitous use. We design a novel blockchain system called...

Peer Discovery With Transitive Trust in Distributed System

It is a common case that resources belong to different people who are distributed across the world. So, for making good use of resources, people have to cooperate with each other. Cooperation is important not only in the physical world but also in cyberspace. Computers holding different resources also need to cooperate with others. The problems...

PlebNet: A self-replicating botnet for privacy protection

As the amount of digital content being shared is increasing, the need for a privacy protecting and resilient method of file sharing grows. New copyright law proposals are suggesting that governments and corporations are attempting to claim control over the use of the internet. As these new laws may lead to restrictions in digital content sharing...

Open-Source Software-Based SRAM-PUF for Secure Data and Key Storage Using Off-The-Shelf SRAM

SRAM PUF has a potential to become the main player in hardware security. Unfor- tunately, currently available solutions are usually locked to specific entities, such as companies or universities. Here, we introduce the first open source project to de- velop software-based SRAM PUF technology using off-the-shelf SRAM. We also present testing...

Communicating with low latency peers: Building a low latency overlay in P2P networks

In decentralized applications requirements on latency are high. For instance, in trading<br/>applications a millisecond latency advantage can save companies millions of dollars. In<br/>this thesis a design is proposed for an overlay in a decentralized peer-to-peer system<br/>that lowers the latency between connected peers. The overlay is...

Creating trust through verification of interaction records

Trust on the internet is largely facilitated by reputation systems on centralized online platforms. How- ever reports of data breaches and privacy issues on such platforms are getting more frequent. We argue that only a decentralized trust system can enable a privacy-driven and fair future of the online economy. This requires a scalable system...

MediTrail: a blockchain-based tamper-proof auditable access log for medical data

After several incident in which the privacy of patients was violated, the need for<br/>logging of access to medical data is evident. In this master thesis, the first prototype is presented for a blockchain-based access log for medical data. This prototype<br/>uses a novel blockchain to create a tamper-proof log. Patients each have their own...

FBase: Trustworthy code module execution

For decades the idea of re-usable software has been seen as the holy grail of software development. But up until recently, there was more discussion about software re-use than actual software re-use. Even though most software uses the same blocks of code over and over again, almost all software is built from the ground up. Today, this situation...

Consensus-less Security: A truly scalable distributed ledger

Distributed ledger technology was expected to spark a technical revolution similar to the internet revolution. After the release of Bitcoin in 2008, many developments have significantly increased the performance of distributed ledger technology. Nevertheless, the first truly scalable ledger has yet to be deployed. All of them have issues with...

Full-system After-cache Memory Tracing for Multi-core Systems using a Distributed Cache Simulator

The gap between CPU and memory performance becomes increasingly larger. Together with a growing memory pressure caused by higher CPU core counts combined with multi-tenant systems, this causes the need for new memory technologies. Recently, various technologies are becoming available for commercial use. Examples of these technologies are memory...

On the Sybil-Proofness of Accounting Mechanisms in P2P Networks

Online P2P file sharing networks rely on the cooperation of participants to function effectively. Agents upand download files to one another without the need for any central authority. If agents all contribute to the network and share roughly the same amounts of data as they contribute the network will operate, however if some agents decide to...