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    Wyświetlanie 1-10 z 10
    Tytuł:
    SAT-based cryptanalysis of modified versions of Feistel Network
    Autorzy:
    Dudek, P.
    Kurkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/121634.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    Feistel network
    sat-based cryptanalysis
    cryptographic functions
    sieć Feistela
    satelitarna kryptoanaliza
    funkcje kryptograficzne
    Opis:
    It is well known that Feistel Network (FN) is the foundation of many symmetric ciphers used in practice. In this paper we present some remarks and experimental results on SAT based cryptanalysis of several modified versions of FN. We investigate different cryptographic functions used in FN schema for better understanding their properties from a security point of view. In our work we study the notions widely used in many ciphers: the xor function, bits rotations, permutations and S-boxes.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2011, 16; 103-110
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On some specification languages of cryptographic protocols
    Autorzy:
    Dudek, P.
    Kurkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/122012.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    cryptographic protocol
    HLPSL language
    VerICS system
    protokół kryptograficzny
    język HLPSL
    system VerICS
    Opis:
    A key element of the security systems in computer networks are cryptographic protocols (CP). These protocols are concurrent algorithms used to provide relevant system security goals. Their main purpose is, for example, amutual authentication (identification) of communicating parties (users, servers), distribution of new keys and session encryption. Literature indicates numerous errors in protocol constructions. Thus, there is a need to create methods for CP specification and verification. In this paper, we investigate a problem of CP specification. The paper discusses the so-called Common Language - the simplest language of CP specification and HLPSL - a specification language used in the European verification project Avispa. Finally, we introduce PTL - the new language developed for CP specification which allows fully automatic verification.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2010, 15; 121-130
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Security Properties of RC5 cipher’s Non Standard Modifications
    Autorzy:
    Kozakiewicz, A.
    Kurkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/122024.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    sieć komputerowa
    kryptografia
    bezpieczeństwo danych
    computer network
    cryptography
    data security
    Opis:
    The RC5 algorithm is the cipher from the family of symmetric ciphers created by Ronald Rivest. Unlike other encryption algorithms, RC5 is designed this way, that a user or a security system architect can change some of its parameters. RC5 is a block cipher processing cipher-text blocks in the sequential rounds, where input of each round is the output of the previous one. In each round data is processed with usage of the key. The parameters of the cipher that can be changed are following: length of the key, length of the processed block and number of rounds. These parameters should be chosen based on the required level of security of communication. However there are such structures in RC5 that use of them is not entirely clear from the point of view for algorithm’s security. The aim of this paper is to examine how a cryptographic power of the cipher is affected by modifications to these structures. For this purpose will be used the well-known NIST tests.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2016, 21; 115-122
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approach to exponentiation with interval-valued power
    Autorzy:
    Tikhonenko-Kędziak, A.
    Kurkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/122552.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    IVFS
    interval-values fuzzy sets
    DST
    Dempster-Shafer theory
    operations on IVFS’s
    teoria Dempster-Shafera
    zbiory rozmyte
    interwałowe zbiory rozmyte
    Opis:
    The main aim of the work is introducing an operation of raising intuitionistic fuzzy values to intuitionistic fuzzy power, which not requiring to conversion of intuitionistic fuzzy values. Introducing an operation of raising intuitionistic fuzzy values to intuitionistic fuzzy power, which does not require conversion of intuitionistic fuzzy values is the main aim of the work. It is known that, in the classical intuitionistic fuzzy sets theory, the use of all aggregation modes is not always possible because of the lack of definition of raising intuitionistic fuzzy values to intuitionistic fuzzy power. Therefore, the specific aim of the work is to present the heuristic method of raising intuitionistic fuzzy values to intuitionistic fuzzy power, and the consideration of its properties.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 4; 157-169
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Remarks of Different Aggregation Modes Applications Within the Framework of Intuitionistic Fuzzy Weights
    Autorzy:
    Tikhonenko-Kędziak, A.
    Kurkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/121800.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
    Tematy:
    zbiór rozmyty
    liczba rzeczywista
    MCDM
    fuzzy set
    real numbers
    Opis:
    In the classical intuitionistic fuzzy sets theory it is known, that the use of all aggregation modes is not always possible, because of the lack of definition of raising intuitionistic fuzzy values to the intuitionistic fuzzy power. The main aim of this work is to introduct an operation of raising of intuitionistic fuzzy values to an intuitionistic fuzzy power,which does not require conversion to intuitionistic fuzzy values. Additionally, we will present a heuristic method of raising an intuitionistic fuzzy values to the intuitionistic fuzzy power and consideration about its properties.
    Źródło:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2016, 21; 145-159
    2450-9302
    Pojawia się w:
    Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Timed models of security protocols including delays in the network
    Autorzy:
    Szymoniak, S.
    Kurkowski, M.
    Piątkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/122609.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    computer science
    mathematical models
    informatyka
    modele matematyczne
    Opis:
    A very important part of the network and computer systems is to ensure an appropriate level of information transmission security. Security is based primarily on properly selected communication in security protocol. Unfortunately, the time-dependent protocols are vulnerable to attacks; therefore there is a need to verify these protocols. For verification purposes, protocols can be modeled using timed automata. During the modeling and verification of the protocols, one should also keep in mind delays in the network. So far, delays in the network were not modeled.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 3; 127-139
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensory Termoanemometryczne w pomiarach parametrów medium w układzie hydraulicznym
    Recent developments in the construction of the thermoanemometric devices
    Autorzy:
    Biernacki, Z.
    Złoto, T.
    Kurkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/158552.pdf
    Data publikacji:
    2001
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Źródło:
    Pomiary Automatyka Kontrola; 2001, R. 47, nr 6, 6; 14-16
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using probabilistic automata for security protocols verification
    Autorzy:
    Siedlecka-Lamch, O.
    Kurkowski, M.
    Piątkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/122825.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    verification of security protocols
    probabilistic methods
    weryfikacja protokołów bezpieczeństwa
    metody probabilistyczne
    protokoły uwierzytelniania
    Opis:
    The article discusses the issues of modeling and the analysis of executions, which is a substantial part of modern communication protocols - authentication protocols, which are generally referred to herein as security protocols. The article presents a way of security protocols executions analysis with the use of probabilistic automata, without well known and widely used perfect cryptography assumption (we assume allowing the possibility of breaking a key with a specified probability). This type of analysis leads to interesting observations about the operation of the protocol and its weaknesses.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2016, 15, 2; 119-125
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new mathematical model for analytical risk assessment and prediction in IT systems
    Autorzy:
    Fray, I. E.
    Kurkowski, M.
    Pejaś, J.
    Maćków, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/206238.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    risk analysis
    risk analysis methods
    formal model for risk analysis
    Opis:
    In this paper, we propose a new formal model to describe risk analysis and measurement process for IT systems. Our model complies with international standards and recommendations for non-profit organisations. The model accounts for solutions used in widely known and recommended risk analysis methods and provides for evaluation of efficacy of these solutions. A simple example illustrates the application of the proposed model for effective risk analysis of any IT system.
    Źródło:
    Control and Cybernetics; 2012, 41, 1; 241-268
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of heat treatment parameters for heavily - loaded aircraft engine components
    Autorzy:
    Rokicki, P.
    Dychtoń, K.
    Nowotnik, A.
    Drajewicz, M.
    Sieniawski, J.
    Kurkowski, D.
    Wierzbińska, M
    Jakubowicz, G.
    Budzik, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/243068.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    aircraft engine components
    vacuum carburizing
    heat treatment
    quenching
    alloy steel microstructure
    Opis:
    Gears, due to their complex shape, carried load and required accuracy are ones of most complex aircraft engine parts. Single tooth damage usually breaks the power transmission and causes failure of the entire gear system. Adequate sustainability and guarantees of transmission is therefore a condition for secure operation of whole device. Particularly high requirements for reliability are put to transmissions used in the aerospace industry. Due to the loads which are transmitted through the gears, the materials used by the manufacturer must have not only high strength but also show the abrasion resistance of the surface layer and the ductility of the core. Proper parameters matching allows to create an element that can operate at higher stresses and loads. In addition, factor strength and abrasion resistance of the surface layer has a significant impact on the life of the gear. Thermo-chemical treatment of industrial gears is a fundamental process, which gives them adequate mechanical properties regarding loads they carry and the surface conditions of work. Among many methods of thermo-chemical treatment used in the industry, the most distinctive are innovative technologies designed to reduce process costs and being more environmentally friendly. The most promising methods in the discussed field are vacuum carburizing and high-pressure hardening, which by their specification of work significantly reduce the emission of CO2 and the duration of the process, without reducing the quality of the final product. The main aim of the paper is to present criteria for selection of heat treatment parameters as a part of thermo-chemical treatment process performed using vacuum methods. Proper heat treatment parameters are crucial in programming of some of final material characteristics as grain size and retained austenite morphology.
    Źródło:
    Journal of KONES; 2013, 20, 2; 349-354
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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