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61.
62.
The two main classes of statistical cryptanalysis are the linear and differential attacks. They have many variants and enhancements such as the multidimensional linear attacks and the truncated differential attacks. The idea of differential-linear cryptanalysis is to apply first a truncated differential attack and then a linear attack on different parts of the cipher and then combine them to a single distinguisher over the cipher. This method is known since 1994 when Langford and Hellman presented the first differential-linear cryptanalysis of the DES. Recently, in 2014, Blondeau and Nyberg presented a general link between differential and linear attacks. In this paper, we apply this link to develop a concise theory of the differential-linear cryptanalysis. The differential-linear attack can be, in the theoretical sense, considered either as a multidimensional linear or a truncated differential attack, but is for both types an extreme case, which is best measured by the differential-linear bias. We give an exact expression of the bias in a closed form under the sole assumption that the two parts of the cipher are independent. Unlike in the case of ordinary differentials and linear approximations, it is not granted that restricting to a subset of characteristics of a differential-linear hull will give a lower bound on the absolute value of the bias. Given this, we revisit the previous treatments of differential-linear bias by Biham et al. in 2002–2003, Liu et al. in 2009, and Lu in 2012, and formulate assumptions under which a single differential-linear characteristic gives a close estimate of the bias. These results are then generalized by considering a subspace of linear approximations over the second part of the cipher. To verify the assumptions made, we present several experiments on a toy-cipher. 相似文献
63.
M.A. Signore A. Rizzo L. Tapfer E. Piscopiello L. Capodieci A. Cappello 《Thin solid films》2010,518(8):1943-1596
ZrNx films were deposited by radiofrequency reactive magnetron sputtering technique in nitrogen and water vapour atmosphere varying the working temperature from room temperature to 600 °C. The films' physical properties were investigated using X-ray diffraction, Secondary Ion Mass Spectroscopy, Atomic Force Microscopy and Transmission Electron Microscopy. It was found that the increase of temperature caused a decrease in the oxygen incorporation and a transition from cubic phase of Zr2ON2 to ZrN one. The formation of nanosized crystalline particles dispersed in the amorphous matrix was observed. 相似文献
64.
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66.
Sol–Gel Synthesis and Characterization of Ag and Au Nanoparticles in SiO2 , TiO2 , and ZrO2 Thin Films
Mauro Epifani Cinzia Giannini Leander Tapfer Lorenzo Vasanelli 《Journal of the American Ceramic Society》2000,83(10):2385-2393
Silver and gold nanoparticles were synthesized by the sol–gel process in SiO2 , TiO2 , and ZrO2 thin films. A versatile method, based on the use of coordination chemistry, is presented for stabilizing Ag+ and Au3+ ions in sol–gel systems. Various ligands of the metal ions were tested, and for each system it was possible to find a suitable ligand capable of stabilizing the metal ions and preventing gold precipitation onto the film surface. Thin films were prepared by spin-coating onto glass or fused silica substrates and then heat-treated at various temperatures in air or H2 atmosphere for nucleating the metal nanoparticles. The Ag particle size was about 10 nm after heating the SiO2 film at 600°C and the TiO2 and ZrO2 films at 500°C. After heat treatment at 500°C, the Au particle size was 13 and 17 nm in the TiO2 and ZrO2 films, respectively. The films were characterized by UV–vis optical absorption spectroscopy and X-ray diffraction, for studying the nucleation and the growth of the metal nanoparticles. The results are discussed with regard to the embedding matrix, the temperature, and the atmosphere of the heat treatment, and it is concluded that crystallization of TiO2 and ZrO2 films may hinder the growth of Ag and Au particles. 相似文献
67.
Jacobs Swen Bloem Roderick Brenguier Romain Ehlers Rüdiger Hell Timotheus Könighofer Robert Pérez Guillermo A. Raskin Jean-François Ryzhyk Leonid Sankur Ocan Seidl Martina Tentrup Leander Walker Adam 《International Journal on Software Tools for Technology Transfer (STTT)》2017,19(3):367-390
International Journal on Software Tools for Technology Transfer - We introduce the reactive synthesis competition (SYNTCOMP), a long-term effort intended to stimulate and guide advances in the... 相似文献
68.
Vitale F Fratoddi I Battocchio C Piscopiello E Tapfer L Russo MV Polzonetti G Giannini C 《Nanoscale research letters》2011,6(1):103
Stable gold nanoparticles stabilized by different mono and bi-functional arenethiols, namely, benzylthiol and 1,4-benzenedimethanethiol,
have been prepared by using a modified Brust's two-phase synthesis. The size, shape, and crystalline structure of the gold
nanoparticles have been determined by high-resolution electron microscopy and full-pattern X-ray powder diffraction analyses.
Nanocrystals diameters have been tuned in the range 2 ÷ 9 nm by a proper variation of Au/S molar ratio. The chemical composition
of gold nanoparticles and their interaction with thiols have been investigated by X-ray photoelectron spectroscopy. In particular,
the formation of networks has been observed with interconnected gold nanoparticles containing 1,4-benzenedimethanethiol as
ligand. 相似文献
69.
Athanassia Athanassiou Laura Blasi Milena De Giorgi Gianvito Caputo Despina Fragouli Elsa Tsiranidou Anna Maria Laera Leander Tapfer Roberto Cingolani 《Polymer Composites》2010,31(6):1075-1083
The nucleation of two kinds of crystalline nanoparticles, zinc sulfide (ZnS), and cadmium sulfide (CdS), is achieved directly into specific sites of polymer matrices after their irradiation with UV laser pulses. The starting samples consist of polymers doped with precursors of Zn or Cd thiolate that are proved to decompose after the absorption of UV light, resulting into the nanoparticles formation. The growth of the crystalline nanostructures is followed throughout the irradiation of the samples with successive incident pulses, by different methods, such as transmission electron microscopy, atomic force microscopy, confocal microscopy, and X‐ray diffraction. Special attention is paid to the difference of the formation pathways of the two kinds of nanoparticles studied, because the Cd thiolate precursor exhibits much higher absorption efficiency than the Zn thiolate one, at the applied UV wavelength. Indeed, CdS nanoparticles become evident after the very first incident UV pulses, whereas the formation of ZnS nanocrystals requires rather prolonged irradiation, always through a macroscopically nondestructive procedure for the polymer matrix. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers 相似文献