124,960 research outputs found
A communication-theoretical view on secret extraction
Get PDFThe recent achievements in enhanced throughput, efficiency, and reliability of wireless communication systems can largely be contributed to the availability of a versatile mathematical framework for the behavior and performance of digital transmission schemes. The key foundation was Shannon's 1948 paper [251] that introduced the notion of capacity. The term capacity is defined as the maximum achievable rate of information exchange, where the maximization is conducted over all possible choices of transmission and detection techniques. The existence of a fundamental limit has acted as an irresistable target for ambitious engineers. However, it was only until the 1990s that the signal processing capabilities allowed a true exploitation of these insights and the throughput of practical systems closely reached the capacity limits. Another important condition was met earlier: the availability of sufficiently realistic statistical models for signals, the noise, and the channel
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
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
An efficient fuzzy extractor for limited noise
Get PDFA fuzzy extractor is a security primitive that allows
for reproducible extraction of an almost uniform key from a
non-uniform noisy source. We analyze a fuzzy extractor scheme that
uses universal hash functions for both information reconciliation and
privacy amplification. This is a useful scheme when the number of
error patterns likely to occur is limited, regardless of the error
probabilities. We derive a sharp bound on the uniformity of the
extracted key, making use of the concatenation property of universal
hash functions and a recent tight formulation of the leftover hash
lemma
Asymptotically false-positive-maximizing attack on non-binary Tardos codes
No full textWe use a method recently introduced by Simone and Skoric to study accusation probabilities for non-binary Tardos fingerprinting codes. We generalize the pre-computation steps in this approach to include a broad class of collusion attack strategies. We analytically derive properties of a special attack that asymptotically maximizes false accusation probabilities. We present numerical results on sufficient code lengths for this attack, and explain the abrupt transitions that occur in these results
Review of sterlet (Acipenser ruthenus L. 1758) (Actinopterygii: Acipenseridae) feeding habits in the River Danube, 1694-852 river km
No full textDjikanovic, V., Skoric, S., Lenhardt, M., Smederevac-Lalic, M., Visnjic-Jeftic, Z., Spasic, S., Mickovic, B. (2014): Review of sterlet (Acipenser ruthenus L. 1758) (Actinopterygii: Acipenseridae) feeding habits in the River Danube, 1694-852 river km. Journal of Natural History 49 (5): 411-417, DOI: 10.1080/00222933.2013.87799
Introduction
No full textOver the past decades a large range of security primitives has been developed to protect digital information. These primitives have solved many traditional security problems and achieved a high level of sophistication. Their security properties are well understood. An intrinsic property, vital for secure operation, is that they are extremely sensitive to small variations in their input.</p
Secure key storage with PUFs
Get PDFNowadays, people carry around devices (cell phones, PDAs, bank passes, etc.) that have a high value. That value is often contained in the data stored in it or lies in the services the device can grant access to (by using secret identification information stored in it). These devices often operate in hostile environments and their protection level is not adequate to deal with that situation. Bank passes and credit cards contain a magnetic stripe where identification information is stored. In the case of bank passes, a PIN is additionally required to withdraw money from an ATM (Automated Teller Machine). At various occasions, it has been shown that by placing a small coil in the reader, the magnetic information stored in the stripe can easily be copied and used to produce a cloned card. Together with eavesdropping the PIN (by listening to the keypad or recording it with a camera), an attacker can easily impersonate the legitimate owner of the bank pass by using the cloned card in combination with the eavesdropped PIN
Figure 2 in Review of sterlet (Acipenser ruthenus L. 1758) (Actinopterygii: Acipenseridae) feeding habits in the River Danube, 1694-852 river km
No full textFigure 2. Relative abundance of food items (bottom fauna taxa) found in the stomach contents of sterlet sampled from the River Danube.Published as part of Djikanovic, V., Skoric, S., Lenhardt, M., Smederevac-Lalic, M., Visnjic-Jeftic, Z., Spasic, S. & Mickovic, B., 2014, Review of sterlet (Acipenser ruthenus L. 1758) (Actinopterygii: Acipenseridae) feeding habits in the River Danube, 1694-852 river km, pp. 411-417 in Journal of Natural History 49 (5) on page 414, DOI: 10.1080/00222933.2013.877991, http://zenodo.org/record/400412
Fingerprint template protection using minutia-pair spectral representations
No full textStorage of biometric data requires some form of template protection in order to preserve the privacy of people enrolled in a biometric database. One approach is to use a Helper Data System. Here it is necessary to transform the raw biometric measurement into a fixed-length representation. In this paper we extend the spectral function approach of Stanko and Skoric [WIFS2017], which provides such a fixed-length representation for fingerprints. First, we introduce a new spectral function that captures different information from the minutia orientations. It is complementary to the original spectral function, and we use both of them to extract information from a fingerprint image. Second, we construct a helper data system consisting of zero-leakage quantisation followed by the Code Offset Method. We show empirical data which demonstrates that applying our helper data system causes only a small performance penalty compared to fingerprint authentication based on the unprotected spectral functions
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