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Preparing for a (RSA) Digital Signature
Dragan Vidakovic,Jelena Kaljevic,Dusko Parezanovic
Journal of Theoretical Physics and Cryptography , 2013,
Abstract: Many people know the general story about RSA and large (probably) prime numbers, without having an idea of how to perform arithmetic operations with the numbers of thousands of bits. Even if they want to develop their own tool for a digital signature, they give up because they think that special hardware-software offers are required for that. In this paper we want to show that even by using a very simple console application, the tools for signature can be developed. Those tools are not as powerful and functional as the products of renowned companies, but they are sufficient to stimulate the interest in cryptography (and the coding of known algorithms is the best way for that), and that is our overriding and permanent goal[3].
Rsa Signature: Behind The Scenes
Dragan Vidakovic,Dusko Parezanovic,Olivera Nikolic,Jelena Kaljevic
Advanced Computing : an International Journal , 2013,
Abstract: In this paper, we present a complete digital signature message stream, just the way the RSAdigitalsignature scheme does it. We will focus on the operations with large numbers due to the fact that operatingwith large numbers is the essence of RSA that cannot be understood by the usual illustrative examples withsmall numbers[1]
Joint Operation in Public Key Cryptography
Dragan Vidakovic,Olivera Nikolic,Jelena Kaljevic,Dusko Parezanovic
International Journal of Advanced Computer Sciences and Applications , 2013,
Abstract: We believe that there is no real data protection without our own tools. Therefore, our permanent aim is to have more of our own codes. In order to achieve that, it is necessary that a lot of young researchers become interested in cryptography. We believe that the encoding of cryptographic algorithms is an important step in that direction, and it is the main reason why in this paper we present a software implementation of finding the inverse element, the operation which is essentially related to both ECC (Elliptic Curve Cryptography) and the RSA schemes of digital signature.
Joint operation in public key cryptography
Dragan Vidakovic,Olivera Nikolic,Dusko Parezanovic,Jelena Kaljevic
Computer Science , 2013,
Abstract: We believe that there is no real data protection without our own tools. Therefore, our permanent aim is to have more of our own codes. In order to achieve that, it is necessary that a lot of young researchers become interested in cryptography. We believe that the encoding of cryptographic algorithms is an important step in that direction, and it is the main reason why in this paper we present a software implementation of finding the inverse element, the operation which is essentially related to both ECC (Elliptic Curve Cryptography) and the RSA schemes of digital signature.
RSA Signature: Behind the Scenes
Dragan Vidakovic,Dusko Parezanovic,Olivera Nikolic,Jelena Kaljevic
Computer Science , 2013, DOI: 10.5121/acij.2013.4203
Abstract: In this paper, we present a complete digital signature message stream, just the way the RSA digital signature scheme does it. We will focus on the operations with large numbers due to the fact that operating with large numbers is the essence of RSA that cannot be understood by the usual illustrative examples with small numbers.
Performance of Risk Measures in Portfolio Construction on Central and South-East European Emerging Markets  [PDF]
Jelena Vidovic
American Journal of Operations Research (AJOR) , 2011, DOI: 10.4236/ajor.2011.14027
Abstract: Aim of this paper is to characterize different risk measures in portfolio construction on seven Central and South-East European stock markets; Slovenia, Croatia, Hungary, Poland, Chez Republic, Bulgaria and Romania. Selected countries are members of EU, except Croatia and Turkey which have candidate status. Empirical part of this paper consists of three stages; at first descriptive statistic on stock returns was performed, afterwards different risk measures were employed in portfolio construction and in the last part, portfolios were tested in the out-of-sample period. Results indicate presence of extreme kurtosis and skewness in stock return series. Resulting portfolios incorporate stocks with extremely high kurtosis and stocks with negative skewness. Portfolio construction based only on risk and return results in major exposure to extreme returns and unsatisfactory portfolio out of sample results.
Health-related quality of life in patients with chronic rhinosinusitis
Dotli? Jelena,Marinkovi? Jelena
Srpski Arhiv za Celokupno Lekarstvo , 2009, DOI: 10.2298/sarh0910470d
Abstract: Introduction The need for assessing the quality of life in chronic rhinosinusitis is emphasized by the medical, social and economic importance of this pathological condition. Questionnaires have been employed in majority of studies while there are no available data that Q method has been used for quality of life research in chronic rhinosinusitis up to the present. Objective The aim of this study was to identify, group and analyze subjective perception of the impact of the disease on health-related quality of life in patients with chronic rhinosinusitis. Methods The study involved 36 consecutive patients of both sexes, older than 10 years of age, diagnosed with chronic rhinosinusitis in the tertiary health clinic in three successive weeks. They were selected for medicamentous treatment. Health-related quality of life was assessed by Q method. Through 34 representative statements, which were sorted by the examinees related to subjective priorities, 10 key quality of life domains were examined. The data were processed by factor analysis employing specialized software package PQMethod. Results Analyzing individual opinions of the examinees, five different opinion-types (factors) on the impact of chronic rhinosinusitis on quality of life were demonstrated. They were marked numerically and descriptively according to dominant characteristics of the group: Factor 1 - stable group (47.2% of individuals), Factor 2 - symptomatic group (11.1% of individuals), Factor 3 - mental group (5.6% of individuals), Factor 4 - physical group (11.1% of individuals) and Factor 5 - optimistic group (25.0% of individuals). Each group was systematically analyzed. Conclusion Majority of patients with chronic rhinosinusits (72.2%) were found to be satisfied with the quality of life, while just a small number (5.6%) heavily bore the illness which especially jeopardised their mental health. This study demonstrates the strength of Q method in analyzing and categorizing subjectivity and offers quality practical information which enables a more comprehensive approach and more adequate intervention in patients with chronic rhinosinusitis.
An atomic absorption spectrometric method for the determination of phosphorus in foodstuffs using the bismuth phosphomolybdate complex
RANDJEL P. MIHAJLOVIC,VESNA M. KALJEVIC,RADMILA M. DZUDOVIC,ZORKA D. STANIC
Journal of the Serbian Chemical Society , 2000,
Abstract: A new indirect AAS method using the bismuth phosphomolybdate complex for the determination of phosphorus in foodstuffs is suggested. The bismuth phosphomolybdate complex in acid medium was extacted with isobutyl methylketone and the phosphorus was determined through bismuth in an air/acetylene flame by utilising the 223.06 nm resonance line of bismuth. The interference caused by antimony and titanium can be neglected in the presence of excess of bismuth. The detection limit of the method is 0.008 mg/mL of phosphorus.
Gypsy ethnic socialization in Serbia
?vorovi? Jelena
Glasnik Etnografskog Instituta SANU , 2005, DOI: 10.2298/gei0553035c
Abstract: Based on original fieldwork among Gypsies in Serbia, this paper explores Gypsy ethnic socialization and argues that Gypsy social isolation, to some extent, is self-imposed through the acceptance of their traditions. Close kin, particularly parents, are found to be the primary socializing agents of Gypsy children. Gypsy children have little or no contact with children from other ethnic groups. A crucial aspect of Gypsy socialization is an emphasis on the distinction between non-Gypsies and Gypsies; that is, between gadje and Roma: Contact with gadje, especially sexual, is considered polluting. Their social isolation results also from their traditional refusal to accept, and become a part of the larger hierarchy of their host populations. The Gypsy tradition of endogamy helped individual Gypsies to survive, leave descendants, and transmit their traditions to them.
A new approach to magic
?vorovi? Jelena
Glasnik Etnografskog Instituta SANU , 2006, DOI: 10.2298/gei0654173c
Abstract: This paper uses the example of traditional practices of magic to suggest ways to incorporate cultural behaviors within the evolutionary paradigm. The first suggestion is to restrict hypotheses to only identifiable variables. This means avoiding the temptation of following the nonevolutionary social sciences in the practice of basing explanations on unverifiable guesses about what beliefs (or memes in evolutionary jargon) may or may not inhabit people's brains. In contrast with previous explanations that magical practices result from beliefs and memes whose primarily purpose is to reduce anxiety, we propose that magic is a form of communication that promotes cooperation and often avoids anti-social behavior. This effect of increased cooperation could explain why traditional forms of magic have probably existed and had significant positive consequences for the participants. To be effective as a means of communication, magical rituals must specify both the content of the message and the receiver of the message. Although the content of the communicative message differs with different types of magic, all magical acts serve a purpose to influence the behavior of the party involved and that is the most significant identifiable effect of such behavior. An advantage of this approach over many previous explanations of magic is that because it focuses on identifiable phenomena, the definitions and explanations used in this approach can be falsified.
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