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    Wyświetlanie 1-11 z 11
    Tytuł:
    Theoretical and Experimental Analysis of Cryptographic Hash Functions
    Autorzy:
    Tchórzewski, Jacek
    Jakóbik, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/309020.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    cryptographic hash functions
    hashing metod
    security
    Opis:
    The paper presents a theoretical introduction to the cryptographic hash function theory and a statistical experimental analysis of selected hash functions. The definition of hash functions, differences between them, their strengths and weaknesses are explained as well. Different hash function types, classes and parameters are described. The features of hash functions are analyzed by performing statistical analysis. Experimental analysis is performed for three certified hash functions: SHA1-160, SHA2-512 and SHA3-512. Such an analysis helps understand the behavior of cryptographic hash functions and may be very helpful for comparing the security level of the hashing method selected. The tests may serve as a basis for examination of each newly proposed hash function. Additionally, the analysis may be harness as a method for comparing future proposals with the existing functions.
    Źródło:
    Journal of Telecommunications and Information Technology; 2019, 1; 125-133
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experiments concerning hashing in the multiobjective tabu search method TAMOCO
    Autorzy:
    Hansen, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/206866.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    hashing
    multiobjective combinatorial optimization (MOCO)
    tabu search
    Opis:
    This paper examines the use of hashing in the multiobjective tabu search, TAMOCO. The hasliing method was suggested by Woodruff and Zemel (1993) as a method of avoiding return to the already examined solutions in the standard single-objective tabu search. While the traditional tabu list is capable of insuring this, it can normally only be used for cycles of a moderate length. The hashing method, however, can efficiently avoid cycles over a much larger number of iterations and must be considered a natural component in the tabu search tool-box. We report from two experiments on practical models where the hashing component has been included into the TAMOCO-procedure ; with two different outcomes.
    Źródło:
    Control and Cybernetics; 2000, 29, 3; 789-798
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of the regional meteorological database
    Autorzy:
    Wojtylak, M.
    Rorbek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954633.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Gdańska
    Tematy:
    hashing function
    meteorological database
    pointer file
    portion file
    Opis:
    The special character of meteorological data, especially various measurement times and standard statistics, makes a programmer solve non-standard problems. The Regional Meteorological Database (RMD) was created in the early nineties of the last century. The RMD uses a data module stored in files, a control module (for data reading and recording) based on indexing by the hashing functions, and a module which makes it possible to display data.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 2; 298-299
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Compounds Activity Concept Learned by SVM Using Robust Jaccard Based Low-dimensional Embedding
    Autorzy:
    Jastrzębski, Stanisław
    Czarnecki, Wojciech Marian
    Powiązania:
    https://bibliotekanauki.pl/articles/1373687.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Support Vector Machines
    Locally Sensitive Hashing
    Jaccard similarity
    Opis:
    Support Vector Machines (SVM) with RBF kernel is one of the most successful models in machine learning based compounds biological activity prediction. Unfortunately, existing datasets are highly skewed and hard to analyze. During our research we try to answer the question how deep is activity concept modeled by SVM. We perform analysis using a model which embeds compounds’ representations in a low-dimensional real space using near neighbour search with Jaccard similarity. As a result we show that concepts learned by SVM is not much more complex than slightly richer nearest neighbours search. As an additional result, we propose a classification technique, based on Locally Sensitive ashing approximating the Jaccard similarity through minhashing technique, which performs well on 80 tested datasets (consisting of 10 proteins with 8 different representations) while in the same time allows fast classification and efficient online training.
    Źródło:
    Schedae Informaticae; 2015, 24; 9-19
    0860-0295
    2083-8476
    Pojawia się w:
    Schedae Informaticae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a Reverse-search System of Similar or Identical Images
    Autorzy:
    Veres, O.
    Kis, Ya.
    Kugivchak, V.
    Rishniak, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/410994.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    analysis
    detector
    descriptor
    image
    key point
    method
    pixel
    hashing
    Opis:
    The article describes the research of image analysis methods. The methods of indexing images for the search of duplicate images, as well as methods for finding similar images based on the definition of key points are described. The prototype of the system was created, and testing of the described methods was carried out. The result of the analysis became the basis for the information system project of reverse search of similar or identical images.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 2; 23-30
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of proteins based on segments structural similarity.
    Autorzy:
    Plewczynski, Dariusz
    Pas, Jakub
    von Grotthuss, Marcin
    Rychlewski, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/1043336.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    3D-hit
    protein structure comparison
    liveBench
    protein structure
    toolShop
    structural hashing
    Opis:
    We present here a simple method for fast and accurate comparison of proteins using their structures. The algorithm is based on structural alignment of segments of Ca chains (with size of 99 or 199 residues). The method is optimized in terms of speed and accuracy. We test it on 97 representative proteins with the similarity measure based on the SCOP classification. We compare our algorithm with the LGscore2 automatic method. Our method has the same accuracy as the LGscore2 algorithm with much faster processing of the whole test set, which is promising. A second test is done using the ToolShop structure prediction evaluation program and shows that our tool is on average slightly less sensitive than the DALI server. Both algorithms give a similar number of correct models, however, the final alignment quality is better in the case of DALI. Our method was implemented under the name 3D-Hit as a web server at http://3dhit.bioinfo.pl/ free for academic use, with a weekly updated database containing a set of 5000 structures from the Protein Data Bank with non-homologous sequences.
    Źródło:
    Acta Biochimica Polonica; 2004, 51, 1; 161-172
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Whirlpool SoPC Implementation : Hardware/Software Co-Design Example
    Autorzy:
    Krawczyk, K.
    Tomaszewicz, P.
    Rawski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/227240.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FPGA
    SoPC
    soft-processor
    Nios II
    custom instruction
    custom component
    hashing function
    Opis:
    The aim of this work was to design a System on Programmable Chip (SoPC), that implements the Whirlpool Hash Function (WHF) algorithm. An assumption of the project was to use an embedded soft-processor NIOS II controlling the whole system, which functionality was extended by a custom logic in order to improve the used algorithm efficiency. This paper presents the Whirlpool Hash Function realized in several SoPC configurations, which differ in implementation complexity and performance.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 1; 21-26
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multifactor Authentication and Key Management Protocol for WSN-assisted IoT Communication
    Autorzy:
    Ara, Tabassum
    Prabhakar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/308649.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    multifactor authentication
    IoT security
    ECC
    timestamp
    one-way bio-hashing
    fuzzy verifier
    WSN
    Opis:
    In this paper a novel multi-factor authentication protocol for IoT applications, relying on enhanced Rabinassisted elliptic curve cryptography, biometric features and time stamping methods, is developed. Furthermore, a fuzzy verification algorithm has been developed to perform receiverlevel user verification, making computation efficient in terms of computational overhead as well as latency. An NS2 simulation-based performance assessment has revealed that the multifactor authentication and key management models we have proposed are capable of not only avoiding security breaches, such as smart card loss (SCLA) and impersonation attacks, but can also ensure the provision of maximum possible QoS levels by offering higher packet delivery and minimum latency rates.
    Źródło:
    Journal of Telecommunications and Information Technology; 2019, 3; 17-26
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Password-authenticated group key establishment from smooth projective hash functions
    Autorzy:
    Bohli, Jens Matthias
    González Vasco, María Isabel
    Steinwandt, Rainer
    Powiązania:
    https://bibliotekanauki.pl/articles/330206.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    group key exchange
    password authentication
    smooth projective hashing
    uzgadnianie klucza
    uwierzytelnienie hasła
    haszowanie rzutowe
    Opis:
    Password-authenticated key exchange (PAKE) protocols allow users sharing a password to agree upon a high entropy secret. Thus, they can be implemented without complex infrastructures that typically involve public keys and certificates. In this paper, a provably secure password-authenticated protocol for group key establishment in the common reference string (CRS) model is presented. While prior constructions of the group (PAKE) can be found in the literature, most of them rely on idealized assumptions, which we do not make here. Furthermore, our protocol is quite efficient, as regardless of the number of involved participants it can be implemented with only three communication rounds. We use a (by now classical) trick of Burmester and Desmedt for deriving group key exchange protocols using a two-party construction as the main building block. In our case, the two-party PAKE used as a base is a one-round protocol by Katz and Vaikuntanathan, which in turn builds upon a special kind of smooth projective hash functions (KV-SPHFs). Smooth projective hash functions (SPHFs) were first introduced by Cramer and Shoup (2002) as a valuable cryptographic primitive for deriving provable secure encryption schemes. These functions and their variants proved useful in many other scenarios. We use here as a main tool a very strong type of SPHF, introduced by Katz and Vaikuntanathan for building a one-round password based two party key exchange protocol. As evidenced by Ben Hamouda et al. (2013), KV-SPHFs can be instantiated on Cramer–Shoup ciphertexts, thus yielding very efficient (and pairing free) constructions.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2019, 29, 4; 797-815
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compact and hash based variants of the suffix array
    Autorzy:
    Grabowski, S.
    Raniszewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/202163.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    string matching
    full-text indexing
    suffix array
    compact indexes
    hashing
    mieszanie
    przeszukiwanie pełnotekstowe
    algorytm przyrostowy
    indeksy
    Opis:
    Full-text indexing aims at building a data structure over a given text capable of efficiently finding arbitrary text patterns, and possibly requiring little space. We propose two suffix array inspired full-text indexes. One, called SA-hash, augments the suffix array with a hash table to speed up pattern searches due to significantly narrowed search interval before the binary search phase. The other, called FBCSA, is a compact data structure, similar to Mäkinen’s compact suffix array (MakCSA), but working on fixed size blocks. Experiments on the widely used Pizza & Chili datasets show that SA-hash is about 2–3 times faster in pattern searches (counts) than the standard suffix array, for the price of requiring 0.2n–1.1n bytes of extra space, where n is the text length. FBCSA, in one of the presented variants, reduces the suffix array size by a factor of about 1.5–2, while it gets close in search times, winning in speed with its competitors known from the literature, MakCSA and LCSA.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 4; 407-418
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An ANN-based scalable hashing algorithm for computational clouds with schedulers
    Autorzy:
    Tchórzewski, Jacek
    Jakóbik, Agnieszka
    Iacono, Mauro
    Powiązania:
    https://bibliotekanauki.pl/articles/2055176.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    hashing algorithm
    artificial neural network
    scalable cryptography algorithm
    computational cloud
    task scheduler
    algorytm haszowania
    sztuczna sieć neuronowa
    algorytm kryptograficzny
    chmura obliczeniowa
    Opis:
    The significant benefits of cloud computing (CC) resulted in an explosion of their usage in the last several years. From the security perspective, CC systems have to offer solutions that fulfil international standards and regulations. In this paper, we propose a model for a hash function having a scalable output. The model is based on an artificial neural network trained to mimic the chaotic behaviour of the Mackey–Glass time series. This hashing method can be used for data integrity checking and digital signature generation. It enables constructing cryptographic services according to the user requirements and time constraints due to scalable output. Extensive simulation experiments are conduced to prove its cryptographic strength, including three tests: a bit prediction test, a series test, and a Hamming distance test. Additionally, flexible hashing function performance tests are run using the CloudSim simulator mimicking a cloud with a global scheduler to investigate the possibility of idle time consumption of virtual machines that may be spent on the scalable hashing protocol. The results obtained show that the proposed hashing method can be used for building light cryptographic protocols. It also enables incorporating the integrity checking algorithm that lowers the idle time of virtual machines during batch task processing.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2021, 31, 4; 697--712
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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