271 research outputs found
Collapse and Reconstitution: Autonomy and the Avant-Garde
No full textA critical discussion of the historical avant-garde, De Stijl and the work of Theo van Doesburg and its reception and re-interpretations through the years. For the occasion of an art installation at the Centraal Museum in Utrecht by the artist Antonis Pittas.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Space & Typ
Text files from Gutenberg database
No full textText files of different size and structure. More precisely, we selected random data from the Gutenberg dataset.
This artefact contains five different datasets with random text files (i.e. e-books in .txt format) from the Gutenberg database. The datasets that we selected ranged from text files with a total size of 184MB to a set of text files with a total size of 1.7GB.
More precisely, the following datasets can be found in this package:
1. 184MB
2. 357MB
3. 670MB
4. 1GB
5. 1.7GB
In our case, we used this dataset to perform extensive experiments on regarding the performance of a Symmetric Searchable Encryption scheme. However, this dataset can be used to measure the performance of any algorithm that is parsing documents, extracting keywords, creates dictionaries etc
Corrigendum to “Functional and immunohistochemical characterization of CCEae3a, a carboxylesterase associated with temephos resistance in the major arbovirus vectors Aedes aegypti and Ae. albopictus” [Insect Biochem. Mol. Biol. 74 (July 2016) 61–67]
No full textThe authors regret that the name of the fourth author was given incorrectly. The correct name should be Antonis Myridakis instead of Antonis Miridakis. The authors would like to apologise for any inconvenience caused
How close before you burn? Questions of ethics and distance in researching crisis and unrest
No full textResearchers examining urban riots or unrest constantly face questions about the motivations behind and impact of their work. These questions verge on the existential, because questioning a research topic essentially interrogates researchers’ role and existence as social scientists. With reference to two project examples from Athens, Greece, the author attempts to show how he has so far tried to grapple with such questions. Researching closely and drawing conclusions from distance: this has been a personal model of adjustable distance to the author’s research subjects, a strategy that seem to have somehow worked for the time being, writes Antonis Vradis
Gollector: Measuring Domain Name Dark Matter from Different Vantage Points
No full textThis paper proposes Gollector, a novel tool for measuring the domain name space from different vantage points. Whereas such measurements have typically been conducted from a single (or few) vantage point, our proposed solution combines multiple measurements in a single system. Gollector allows us to express the relative difference in the covered domain name space, and the temporal characteristics, as domain name dark matter. We leverage a three-week trace from four vantage points, by applying the tool to three security-related use cases: early domain registration detection, data leakage in a split-horizon situation, and a proposed method for subdomain enumeration. We release the Gollector source code to the research community to support future research in this field.</p
Preliminary Security Analysis, Formalisation, and Verification of OpenTitan Secure Boot Code
No full textWe perform a preliminary security analysis of the initial boot stage for the OpenTitan silicon root of trust, including formalisation and verification of relevant security goals using both bounded model checking and (unbounded) model checking. We further report on a potential vulnerability in the platform and show how it can be reproduced using formal modelling and argue that co-verification would be able to detect such vulnerabilities for high assurance projects.</p
Sharing in the Rain: Secure and Efficient Data Sharing for the Cloud
No full textCloud storage has rapidly become a cornerstone of many businesses and has moved from an early adopters stage to an early majority, where we typically see explosive deployments. As companies rush to join the cloud revolution, it has become vital to create the necessary tools that will effectively protect users' data from unauthorized access. Nevertheless, sharing data between multiple users' under the same domain in a secure and efficient way is not trivial. In this paper, we propose Sharing in the Rain – a protocol that allows cloud users' to securely share their data based on predefined policies. The proposed protocol is based on Attribute-Based Encryption (ABE) and allows users' to encrypt data based on certain policies and attributes. Moreover, we use a Key-Policy Attribute-Based technique through which access revocation is optimized. More precisely, we show how to securely and efficiently remove access to a file, for a certain user that is misbehaving or is no longer part of a user group, without having to decrypt and re-encrypt the original data with a new key or a new policy
The Lord of the Shares: Combining Attribute-Based Encryption and Searchable Encryption for Flexible Data Sharing
No full textSecure cloud storage is considered one of the most important issues that both businesses and end-users are considering before moving their private data to the cloud. Lately, we have seen some interesting approaches that are based either on the promising concept of Symmetric Searchable Encryption (SSE) or on the well-studied field of Attribute-Based Encryption (ABE). In the first case, researchers are trying to design protocols where users\u27 data will be protected from both \textit{internal} and \textit{external} attacks without paying the necessary attention to the problem of user revocation. On the other hand, in the second case existing approaches address the problem of revocation. However, the overall efficiency of these systems is compromised since the proposed protocols are solely based on ABE schemes and the size of the produced ciphertexts and the time required to decrypt grows with the complexity of the access formula. In this paper, we propose a protocol that combines \textit{both} SSE and ABE in a way that the main advantages of each scheme are used. The proposed protocol allows users to directly search over encrypted data by using an SSE scheme while the corresponding symmetric key that is needed for the decryption is protected via a Ciphertext-Policy Attribute-Based Encryption scheme
X-Pro : Distributed XDP Proxies Against Botnets of Things
No full textThe steadily increasing Internet of Things (IoT) devices are vulnerable to be used as bots to launch distributed-denial-of-service (DDoS) attacks. In this paper, we present X-Pro, a distributed XDP proxy to counteract DDoS attacks. We propose a source-based defense mechanism where proxies located between the IoT devices and the victim performs flow policing on all IoT traffic from a single administrative domain. The proposed proxy architecture can be integrated in widely used IoT frameworks as well as telecommunication networks. The proxies are working synchronously to block bogus messages and to detect traffic levels above predefined thresholds. Our implementation leverages eXpress Data Path (XDP), a programmable packet processing in the Linux kernel, as the main engine in the proxy. We evaluate X-Pro from several standpoints and conclude that our solution offers efficient DoS traffic blocking for both low-rate or massive attacks. Depending on the device side implementation selection, the computational overhead is cheap at the cost of some bandwidth loss
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