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1

Cryptanalysis and Improvement for Certificateless Aggregate Signature

Li J., Yuan H., Zhang Y.

Fundamenta Informaticae

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2018

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Vol. 157, nr 1/2

111--123

EN

In order to satisfy application in resource constrained environment, aggregate signature schemes have been widely investigated. Recently, He et al. pointed out that certificateless aggregate signature (CLAS) scheme proposed by Xiong et al. was insecure against the Type II adversary and presented an possible improvement. In this article, we show that their improved scheme is not secure against a malicious-but-passive KGC attack. We analyze attack reason and propose an improved certificateless aggregate signature scheme. Based on the CDH difficult problem assumption, the proposed CLAS scheme is existentially unforgeable against adaptive chosen-message attacks in the random oracle model.

2

Interval-valued Fuzzy Soft Decision Making Methods Based on MABAC, Similarity Measure and EDAS

Peng X., Dai J., Yuan H.

Fundamenta Informaticae

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2017

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Vol. 152, nr 4

373--396

EN

Interval-valued fuzzy soft decision making problems have obtained great popularity recently. Most of the current methods depend on level soft set that provide choice value of alternatives to be ranked. Such choice value always encounter the equal condition that the optimal alternative can't be gained. Most important of all, the current decision making procedure is not in accordance with the way that the decision makers think about the decision making problems. In this paper, we initiate a new axiomatic definition of interval-valued fuzzy distance measure and similarity measure, which is expressed by interval-valued fuzzy number (IVFN) that will reduce the information loss and keep more original information. Later, the objective weights of various parameters are determined via grey system theory, meanwhile, we develop the combined weights, which can show both the subjective information and the objective information. Then, we present three algorithms to solve interval-valued fuzzy soft decision making problems by Multi- Attributive Border Approximation area Comparison (MABAC), Evaluation based on Distance from Average Solution (EDAS) and new similarity measure. Three approaches solve some unreasonable conditions and promote the development of decision making methods. Finally, the effectiveness and feasibility of approaches are demonstrated by some numerical examples.

3

Fundamental Properties of Pythagorean Fuzzy Aggregation Operators

Peng X., Yuan H.

Fundamenta Informaticae

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2016

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Vol. 147, nr 4

415--446

EN

In this paper, some new inequalities of Pythagorean fuzzy weighted averaging (PFWA) operator are explored. Later, we develop some Pythagorean fuzzy point operators and introduce generalized Pythagorean fuzzy weighed averaging (GPFWA) operator. Moreover, combining the Pythagorean fuzzy point operators with GPFWA operator, we present some generalized Pythagorean fuzzy point weighted averaging (GPFPWA) operators, which can adjust the degree of the aggregated arguments with some parameters. Based on GPFPWA operators and normal distribution, an approach to multiple attribute decision making (MADM) problem with completely unknown weight information is proposed under Pythagorean fuzzy environment. Finally, an illustrative example is given to show the feasibility and superiority of the developed method.

4

Ecological risk assessment of heavy metals in sediments of a riverine wetland, Huaihe River Watershed, China

Yuan H., Pan W., Zhu Z., Wei Y., Geng Q., An S.

Ecological Chemistry and Engineering. S

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2015

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Vol. 22, nr 2

231--242

EN

The concentrations of Zn, Cr, Cu, As, Cd, and Pb in sediment cores collected from a representative riverine wetland located in the Huaihe River watershed, China, dramaticlly increased from the bottom to upper layer of the cores. Application of principal component analysis (PCA) and enrichment factor (EF) suggested that heavy metals might primarily have been derived from the inflow of contaminated water from an industrial park and agricultural region. Component 1 of the PCA was dominated by Zn, Cr, Cu, Cd, and Pb, while Component 2 was dominated by As. Metals’ high concentrations and EF values showed that the anthropogenic pollutants have increased sharply in recent years and reflect the continuous development of industry and agriculture in the region of the wetland, with a corresponding dramatic deterioration of the environment due to constant effluent of pollutants. Cd exerted the highest potential ecological risk of individual metals of sediment cores. Additionally, integrated RI values for all metals indicated that sediments possessed low ecological risk from the bottom to about 6 cm depth of the cores, moderate ecological risk from about 5 cm depth upwards, then considerable ecological risk from 4 cm depth to the top layer of the sediment cores, which demonstrates a continuous deterioration of environmental quality in recent years in this region.

PL

Stężenia Zn, Cr, Cu, As, Cd i Pb w rdzeniach osadów pobranych z reprezentatywnych podmokłych terenów nadrzecznych, znajdujących się w zlewni rzeki Huaihe, Chiny, wykazały znaczne wzrosty od dołu do górnej warstwy rdzeni. Zastosowanie analizy głównych składowych (PCA) i czynnika wzbogacania (EF) wykazało, że źródłem metali ciężkich mogą być przede wszystkim zanieczyszczone wody z parku przemysłowego i z obszarów rolniczych regionu. Składowa 1 PCA było zdominowane przez Zn, Cr, Cu, Cd, i Pb, natomiast składowa 2 była zdominowana przez As. Duże stężenia metali i wartości EF wykazały, że antropogenne zanieczyszczenie gwałtownie wzrosło w ostatnich latach i odzwierciedla ciągły rozwój przemysłu i rolnictwa w regionie nadrzecznym, z odpowiednim drastycznym pogorszeniem stanu środowiska ze względu na stałe zanieczyszczenie ściekami. Cd stwarza największe potencjalne ryzyko ekologiczne spośród wszystkich metali rdzeni osadów. Dodatkowo, zintegrowane wartości RI dla wszystkich metali wskazują, że osady tworzyły niskie zagrożenie ekologiczne od dołu do około 6 cm głębokości rdzeni, umiarkowane ryzyko ekologiczne od około 5 cm głębokości do góry. Znaczne zagrożenie ekologiczne stwarzają osady od głębokości 4 cm do warstwy wierzchniej rdzenia, co świadczy o ciągłym pogarszaniu się jakości środowiska w ostatnich latach w tym regionie.

5

Robust Cepstrum Radio Frequency Fingerprint Transformed from BPSK Signal

Yuan H., Bao Z., Xu C., Zhang G.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 1b

193--195

EN

Identifying wireless devices based on Radio Frequency fingerprint (RFF) is a promising physical layer security methodology. One practical issue is the robustness of RFF affected by wireless multi-path channels, etc. Proposed is a kind of RFF with robustness for identifying digital BPSK transmitters. The cepstrum of the received BPSK signal is obtained and then low-pass filtered, the result signal is mainly determined by device impulse response, and thus is robust. The proposed fingerprint can be used in the fusion identification of BPSK wireless transmitters.

PL

W artykule opisano sposób radiowej identyfikacji urządzeń bezprzewodowych, o bezpiecznej identyfikacji cyfrowych nadajników BPSK. Uzyskane cepstrum odebranego sygnału BPSK, poddawane jest filtracji dolno-przepustowej, co w efekcie daje sygnał wyznaczony przez odpowiedź impulsową urządzenia. Opracowany algorytm można wykorzystać w rozpoznaniu łączenia się nadajników BPSK.