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Kumari S.,Dr. M.G.R. Educational and Research Institute | Khan M.K.,King Saud University | Muhaya F.B.,King Saud University | Kumar R.,Dbs College
Proceedings - 2013 International Symposium on Biometrics and Security Technologies, ISBAST 2013 | Year: 2013

Smart card is a widely accepted user authentication tool to ensure only authorized access to resources available via open networks. In 2010, Sood et al. and Song independently examined a smart card based authentication scheme proposed by Xu et al. They showed that in Xu et al.'s scheme an internal user of the system could turn hostile to impersonate other users of the system. Sood et al. and Song also proposed schemes in order to improve scheme proposed by Xu et al.'s. Recently, Chen et al. identified some security problems in the improvements proposed by Sood et al. and Song. To fix these problems Chen et al. presented another scheme, which they claimed to provide mutual authentication and withstand, lost smart card attack. Undoubtedly, in their scheme user can also verify the legitimacy of server but we find that the scheme fails to resist impersonation attacks and privileged insider attack. We also show that the scheme does not provide user anonymity and confidentiality to air messages. In addition, an attacker can guess a user's password from his lost/stolen smart card. © 2013 IEEE. Source


Dixit S.C.,Dbs College | Singh R.K.,P.A. College
E-Journal of Chemistry | Year: 2012

Reactions of dichlorobis(cyclopentadienyl)zirconium (IV) with pyridinedicarboxylic acids viz. quinolinic acids (QAH 2), 2, 4-pyridine dicarboxylic acid (PAH 2), isocinchomeronic acid (IAH 2), cinchomeronic acid(cAH 2) and dinicotinic acid(dAH 2) were carried out in different stoichiometric ratios. Complexes of the type Cp 2Zr (QAH)Cl, Cp 2Zr (QAH) 2, Cp2Zr (PAH)Cl, Cp 2Zr (PAH) 2, Cp 2Zr (IAH)Cl, Cp 2Zr (IAH) 2, Cp 2Zr(cAH)Cl, Cp 2Zr(cAH) 2, Cp 2Zr(dAH)Cl and Cp 2Zr(dAH) 2 were obtained. These new complexes were characterized on the basis of their elemental analyses, electrical conductance, magnetic moment and spectral data. Source


Tiwari S.,Nmsn Das College | Saxena A.K.,Nmsn Das College | Saxena D.,Dbs College
Asian Journal of Chemistry | Year: 2011

The effect on the optical and other physical properties with the addition of Ag content, viz, Tg, , Hs, , Z, Ncon, L, δEg and energetic parameter A of Ge30-xSe70Agx (x = 0, 5, 10, 15, 20 at %) glassy alloy have been examined theoretically. The relationship between the Tg and has been estimated by using Tichy-Ticha approach. The relationship between ΔEg and chemical composition has been discussed in terms of the Hs and Z. In order to correlate the optical parameter (DEg) with film composition we used the energetic parameter (A). It has been found that , Hs, (ΔE g), Tg, decreases whereas deviation of stoichiometry R, Ncon and the energetic parameter A, increases with increasing Ag content in Ge-Se-Ag system. Source


Shukla R.K.,Vssd College | Kumar A.,PSIT | Srivastava U.,PSIT | Pandey V.K.,Dbs College
International Journal of Thermophysics | Year: 2016

Density and acoustic velocity were measured for binary liquid mixtures of formamide, N-methylacetamide (NMA), dimethylformamide (DMF), and dimethylacetamide (DMA) with acetonitrile at atmospheric pressure and 293.15 K, 298.15 K, 303.15 K, 308.15 K, or 313.15 K over the concentration range 0.12 to 0.97. Models assuming association and nonassociation of the components of the mixtures were used to predict the behavior of the studied liquids, which would typically show weak interactions. The measured properties were fitted to the Redlich–Kister polynomial to estimate the binary coefficients and standard errors. The data were used to study the molecular interactions in the binary mixtures. Furthermore, the McAllister multibody interaction model was used to correlate the properties of the binary liquid mixtures. Testing of the nonassociation and association models for the different systems showed that, compared with the nonassociation model theoretical results, the association model theoretical results were more consistent with the experimental results. © 2016, Springer Science+Business Media New York. Source


Kumar A.,HBTI | Agarwal P.,Dbs College | Saxena A.,University
AIP Conference Proceedings | Year: 2013

The phase change memory is the revolutionary technology for computer world today. Phase change memory alloy is composed of chalcogenide glasses. In the present work Ag is doped in binary Se70Te30 system and activation energy of crystallization is calculated. These ternary alloys are explored in various fields like photo doping, optical imaging, and phase change optical recording. The crystallization kinetics of various ternary Se 70Te30-xAgx(x=0,2,4,6) alloys are studied by using Non-isothermal Iso-Conversional methods. The dependence of activation energy Ec is discussed by various methods. The result shows that the activation energy Ec plays a vital role in proving these materials as best applicable materials in optical phase change recording devices. © 2013 AIP Publishing LLC. Source

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