1,720,959 research outputs found
SafeLib: Secure and High- Performance Outsourcing of Network Functions Made Easy
Full text linkOutsourcing virtual network functions (VNFs) to third-party service providers, such as public clouds, has become the norm. While outsourcing brings many benefits, including scalability, streamlined management, and lower initial investment, it also introduces security concerns. Due to the lack of trust in the cloud, organizations may opt to protect both their network functions and the traffic flowing through them. To overcome security challenges, the research community has proposed several solutions. Mainly, these solutions fall into two categories: i) solutions using the cryptographic approach and ii) solutions using a trusted hardware mechanism. This thesis aims to examine the research solutions aiming to overcome security challenges that come with outsourcing VNFs to a third-party service while providing a detailed analysis of which of these two categories is a better approach, and builds a novel solution that aims to fill the gap of existing solutions while maintaining a reasonable performance overhead, and scalability compared to other solutions. The research contributions of this PhD work are divided into two main parts.
First, we make an extensive study of the existing research work, which aims to answer the same research questions. After identifying these works, we analyse them, divide them into two main categories as mentioned above and analyse which of these categories is a better option. We make a more detailed analysis of the solutions that fall into this category and identify the gaps. To be able to build a high-level architecture, we explored existing research works which we can build upon. These works help our solution to fill in the gaps left by other existing solutions.
The second part of this PhD work was mainly practical work. We developed our solution while performing multiple performance measurements. As mentioned above, our solution is built upon other libraries/frameworks developed by other researchers/industries, so in order for us to successfully incorporate such libraries into our solution, the following steps were carried out; i) First, we analyse if those libraries were compatible with each other. In other words, we had to make sure that we could use those libraries together, ii) Second, we analyse the source code of each of those libraries/frameworks, iii) Third, we started building our solution while modifying the source code of each library/framework in order to answer our main research question, and maintain a desirable performance overhead, iv) Lastly we build our setup environment for running our solution, and carry out several measurement tests.
To summarize, the aim of the thesis is to provide a solution that VNF developers can use for developing their VNFs, and then securely outsourcing them to a third-party provider. Our solution is divided into two main libraries: i) a library used to develop and securely outsource stateless VNFs, and ii) a library used to develop and securely outsource stateful VNFs. Our analysis shows that our solution reduces the effort to develop VNFs significantly, by providing a high-level set of APIs. Our solution is shown to provide support against a wide range of attacks, which is achieved by incorporating Intel SGX, IPSec tunnel, and some other techniques developed by us and explored later in the thesis. Lastly, our solution provides scalability and a reasonable performance overhead
Privacy for Secure Distributed Storage Networks
No full textV outsourcingu dat mrak scénář poskytovatelů třetích stran umožňuje výhody zpracování a značné náklady. V důsledku toho je vysoká tendence různých společností zadávat své údaje a služby třetím poskytovatelům služeb. Na druhé straně existuje velké obavy, pokud jde o soukromí externě dat. Vzhledem k tomu, v úložném systému útok postranním kanálem je to možné, může dojít k úniku citlivých informací, outsourcing přichází s drahou cenu, a tak musíme vyvinout algoritmy, které mohou zabránit takové informace, které mají být známy poskytovateli cloudu. Tyto bezpečnostní problémy jsou zde: škodlivé zasvěcenci, data lokalita, nedostatečné kontrole outsourcovaných údajů, legislativa otázky, dat a dostupnost služeb, dodavatele lock-in atd. \ Par Hlavním cílem této práce je dělat výzkum přes existujících algoritmů, které používají cloud computing platforem, aby se zabránilo takovému úniku informací a vyvinout a zavést vhodný protokol, který může skrývat takové citlivé informace od poskytovatelů cloudových. Soukromé získávání informací Protocol je jedním ze způsobů, jak dosáhnout, aby. Soukromé získávání informací je databáze, technika, která využívá myšlenku z kryptografie k ochraně soukromí uživatelů tím, že skryje podrobnosti o svých dotazů od provozovatelů databáze. Existuje několik PIR Protokoly, ale v této práci je pozornost zaměřena na PIR protokol, který nese shamirovo sdílení tajemství Threshold Scheme.In a cloud scenario outsourcing data to third party providers enables processing benefits and significant cost. As a result there is a high tendency of different companies to outsource their data and services to third party service providers. On the other hand, there exists a high concern when it comes to privacy of the outsourced data. Since in a storage system a side channel attack is possible, it can cause the leakage of sensitive information, outsourcing comes with an expensive price, thus we need to develop algorithms which can prevent such information to be known by cloud providers. The security issues here are: malicious insiders, data locality, lack of control of the outsourced data, legislation issues, data and service availability, vendor lock-in etc. \par The main goal of the thesis is to do a research over the existing algorithms which are used by cloud computing platforms in order to prevent such leakage information and to develop and implement a suitable protocol which can hide such sensitive information from cloud providers. Private Information Retrieval Protocol is one way to achieve that. Private Information Retrieval is a database technique that uses idea from cryptography to protect the privacy of users by hiding the details of their queries from the operators of the database. There are several PIR Protocols but in this thesis the focus is on PIR Protocol which uses Shamir Secret Sharing Threshold Scheme
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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