1,720,992 research outputs found
A trusted versioning file system for passive mobile storage devices
No full textVersioning file systems are useful in applications like post-intrusion file system analysis, or reliable file retention and retrievability as required by legal regulations for sensitive data management. Secure versioning file systems provide essential security functionalities such as data integrity, data confidentiality, access control, and verifiable audit trails. However, these tools build on top of centralized data repositories operating within a trusted infrastructure. They often fail to offer the same security properties when applied to repositories lying on decentralized, portable storage devices like USB flash drives and memory chip cards. The reason is that portable storage devices are usually passive, i.e., they cannot enforce any security policy on their own. Instead, they can be plugged in any (untrusted) platform which may not correctly maintain or intentionally corrupt the versioning information on the device. However, we point out that analogous concerns are also raised in those scenarios in which data repositories are hosted by outsourced cloud-based storage services whose providers might not satisfy certain security requirements. In this paper we present TVFS: a Trusted Versioning File System which stores data on untrusted storage devices. TVFS has the following features: (1) file integrity and confidentiality; (2) trustworthy data retention and retrievability; and (3) verifiable history of changes in a seamless interval of time. With TVFS any unauthorized data change or corruption (possibly resulting from being connected to an untrusted platform) can be detected when it is connected to a legitimate trusted platform again. We present a prototype implementation and discuss its performance and security properties. We highlight that TVFS could fit those scenarios where different stakeholders concurrently access and updates shared data, such as financial and e-health multiparty services as well as civil protection application systems such as hazardous waste tracement systems, where the ability to reliably keep track of documents history is a strong (or legally enforced) requirement. © 2013 Elsevier Ltd. All rights reserved
Transparent Mobile Storage Protection in Trusted Virtual Domains
Full text linkMobile Storage Devices, such as USB flash drives, offer a flexible solution for the transport and exchange of data. Nevertheless, in order to prevent unauthorized access to sensitive data, many enterprises require strict security policies for the use of such devices with the effect of rendering their advantages rather unfruitful.
Trusted Virtual Domains (TVDs) provide a secure IT infrastructure offering a homogeneous and transparent enforcement of access control policies on data and network resources, however, the current model does not specifically deal with Mobile Storage Devices.
In this paper, we present an extension of the TVD architecture to incorporate the usage of Mobile Storage Devices. Our proposal addresses three major issues: coherent extension of TVD policy enforcement by introducing architectural components that feature identification and management of transitory devices; transparent mandatory encryption of sensitive data stored on mobile devices; and highly dynamic centralized key management service. In particular we address offline scenarios allowing users to access and modify data while being temporarily disconnected from the domain. We also present a prototype implementation based on the Turaya security kernel
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Trusted virtual domains: Color your network
No full textTrusted Virtual Domains (TVDs) provide a secure IT infrastructure offering a homogeneous and transparent enforcement of access control policies on data and network resources. In this article, we give an overview of the fundamental ideas and basic concepts behind TVDs, present a realization of TVDs, and discuss application scenarios
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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