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Kouwenhoven, Robin (author)Foremost among the challenges of the Bitcoin blockchain is the scalability bottleneck. To address this issue, the Lightning Network, a payment channel network, was created. Lightning is a payment channel network that is source-routed and uses onion routing, like Tor. However, unlike Tor, the routing path is determined by optimizing a cost...master thesis 2024
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Moonen, Djoshua (author)Payment channels allow parties to utilize the blockchain to send transactions for a cheaper fee. Previous work has analyzed to which degree a party can profit by facilitating the transaction process. The aim is to increase the usability of the network and to be rewarded for providing this service. However, previous work focuses on maximizing the...master thesis 2023
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Trap, Cyril (author)Privacy is a human right, yet, people’s behavior on the web is constantly tracked. Tor, an anonymity network, is an effective defence against tracking. However, Tor’s multiplexing of logically independent data streams into a single TCP connection causes issues. Tor with QUIC has been implemented as an alternative with better performance but it...master thesis 2023
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Zarin, Naqib (author)Blockchain technology has proven to be a promising solution for decentralized systems in various industries. At the core of a blockchain system is the peer-to-peer (P2P) overlay, which facilitates communication be- tween parties in the blockchain system. Recently, there is increasing evidence that this P2P overlay plays a major role in limited...master thesis 2023
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van Stam, Just (author)Begun in 2020, Polkadot is one of the largest blockchains in market capitalization and development. However, privacy on the Polkadot network has yet to be one of the key focus points. Especially unlinkability between the user’s IP address and Polkadot address is essential. Without this unlinkability, users are vulnerable to targeted ads,...master thesis 2022
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Reurink, Andries (author)The set of regression and integration tests at many modern software companies is huge. It is difficult to run all tests after each code change, so the tests are often run for batches of code changes by different developers, late in the release cycle. This has developers waiting for tests longer than desirable and makes it...master thesis 2022
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Psathas, Steffano (author)A machine learning classifier can be tricked us- ing adversarial attacks, attacks that alter images slightly to make the target model misclassify the image. To create adversarial attacks on black-box classifiers, a substitute model can be created us- ing model stealing. The research question this re- port address is the topic of using model...bachelor thesis 2022
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Vigilanza Lorenzo, Pietro (author)Machine Learning (ML) models are vulnerable to adversarial samples — human imperceptible changes to regular input to elicit wrong output on a given model. Plenty of adversarial attacks assume an attacker has access to the underlying model or access to the data used to train the model. Instead, in this paper we focus on the effects the data...bachelor thesis 2022
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Dwivedi, Kanish (author)Adversarial training and its variants have become the standard defense against adversarial attacks - perturbed inputs designed to fool the model. Boosting techniques such as Adaboost have been successful for binary classification problems, however, there is limited research in the application of them for providing adversarial robustness. In this...bachelor thesis 2022
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van Veen, Floris (author)Model extraction attacks are attacks which generate a substitute model of a targeted victim neural network. It is possible to perform these attacks without a preexisting dataset, but doing so requires a very high number of queries to be sent to the victim model. This is otfen in the realm of several million queries. The more difficult the...bachelor thesis 2022
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Jansen, Joost (author)In recent years, there has been a great deal of studies about the optimisation of generating adversarial examples for Deep Neural Networks (DNNs) in a black-box environment. The use of gradient-based techniques to get the adversarial images in a minimal amount of input-output correspondence with the attacked model has been extensively studied....bachelor thesis 2022
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Hendrikx, Roemer (author)In the past 8 years, Bitcoin has dominated the cryptocurrency markets and drawn attention from academia, developers and legislators alike. Bitcoin has been praised for its impact on decentralizing trust and currencies but also criticized for its volatility and energy-inefficient consensus mechanism. To improve its limitations, in 2016, payment...master thesis 2022
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Heijligers, Jaap (author)Tor is the most popular tool for anonymous online communication. However, the performance of Tor's volunteer-run network is suboptimal when network congestion occurs. Within Tor, many connections are multiplexed over a single TCP connection between relays, which causes a head-of-line blocking problem, degrading relay performance. In this thesis,...master thesis 2021
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de Smidt, Emiel (author)There is an everlasting arms race between censoring bodies and those in its grip. When the censor is employing increasingly sophisticated techniques to digitally monitor and restrict those in its scope, equally sophisticated means to circumvent the digital repression come forward. Those suffering under digital censorship are using nifty ways to...master thesis 2021
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Pingle, Anant (author)Tor is an anonymity network used by a vast number of users in order to protect their privacy on the internet. It should not come as a surprise that this service is also used for abuse such as Denial of service attacks and other malicious activities because of the anonymity it provides. For protecting themselves from this abuse, websites block...bachelor thesis 2021
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Iacoban, Paula (author)Anonymity networks, such as The Invisible Internet Project, commonly known as I2P, enable privacy aware users to stay anonymous on the Internet and provide secure methods of communication, as well as multi-layered encryption. Despite the many innocent reasons users opt for online anonymity, these particular networks are censored at times, as...bachelor thesis 2021
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Biazin do Nascimento, Francine (author)There are many valid reasons for someone to choose to stay anonymous online, not least of which is the fact that online privacy is a human right. However, discrimination against users of anonymity networks from web-servers and content distribution networks on the grounds of defense against malicious users often means that genuine users are faced...bachelor thesis 2021
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Mulder, Jurgen (author)Users of anonymity networks face differential treatment and sometimes get blocked by websites, it is currently unclear how common this blocking is. This research aims to provide an overview of how common this blocking is while utilizing the AN.ON anonymity network. The analysis is accomplished by utilizing automated web scraping and processing...bachelor thesis 2021
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Tutuarima, Willemijn (author)Censorship and privacy issues have led people to use VPNs when accessing the internet. These VPNs not only try to protect their user but they are also associated with criminality and cyber attacks. Because of this, websites have started to resort to blacklisting the IP addresses that are used by the VPNs, thus blocking both genuine and malicious...bachelor thesis 2021
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Georgiev, Ivaylo (author)Payment Channel Networks have been developed to deal with the scalability issue in blockchain technologies. Using them, two parties can make multiple payments between themselves relatively fast. However, usually the channels have too small capacities, unable to handle a big payment. Allowing to split a payment into smaller payments and...bachelor thesis 2021
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