1,721,460 research outputs found
Optimization of the ROCA (CVE-2017-15361) Attack
Get PDF2017. aastal avastasid Tšehhi teadlased Infineoni loodud RSA võtmete genereerimis algoritmist haavatavuse CVE-2017-15361 (ROCA rünnak). Leiti, et Infineoni algoritmiga genereeritud 2048-bitiseid võtmeid on võimalik faktoriseerida halvimal juhul kõigest 140.8 CPU aastaga. Antud algortimi kasutades olid genereeritud võtmed 750 000 Eesti ID-kaardi jaoks. Selle magistritöö raames implementeeriti ROCA rünnak ning genereeritud võtmeid ja haavatavaid kiipkaarte analüüsides loodi rünnakust uus, optimiseeritud versioon, mille abil on võimalik sooritada rünnak 140.8 aasta asemel 35.2 CPU aastaga 90% võtmete puhul ning 70.4 aastaga ülejäänud võtmetel. Lisaks loodi paralleliseeritud versioon rünnakust kasutades teadusarvutuste klastrit (HPC).In 2017, Czech researchers found the vulnerability CVE-2017-15361 (the ROCA attack) in Infineon's proprietary RSA key generation algorithm. The researchers found that 2048-bit RSA key can be factored in only 140.8 CPU-years in the worst case scenario. The algorithm turned out to be used by 750 000 Estonian ID-cards. In this thesis, we implemented the ROCA attack and, based on the properties observed from the keys generated by the affected smartcards, found further optimizations which allow to improve the original attack from 140.8 CPU-years to 35.2 CPU-years for 90% of the keys and 70.4 CPU-years for the remaining 10% of the keys. As additional contribution, we provide a parallelized version of the attack that can be executed on an HPC
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
The TPM: Technical Overview of Microsoft’s Interim Measures against CVE-2017-15361
No full textThis work is part of the Windows Insight series. This series aims to assist efforts on analysing inner working principles, functionalities, and properties of the Microsoft Windows operating system. The content of this work has been created in the course of the project named ’Studie zu Systemaufbau, Protokollierung, Härtung und Sicherheitsfunktionen in Windows 10 (SiSyPHuS Win10)’ (ger.) - ’Study of system design, logging, hardening, and security functions in Windows 10’ (eng.). This project has been contracted by the German Federal Office for Information Security (ger., Bundesamt für Sicherheit in der Informationstechnik - BSI).This document provides a technical overview of Microsoft’s interim measures against a vulnerability in Trusted Platform Module (TPM) chipsets manufactured by Infineon ([Common Vulnerabilities and Exposures] CVE-2017-15361)
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