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  • Resultat 14421-14430 av 27789
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14421.
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14422.
  • Kulyk, Oksana, et al. (författare)
  • Extending Helios Towards Private Eligibility Verifiability
  • 2015
  • Ingår i: E-Voting and Identity. - ham : Springer. - 9783319222707 - 9783319222691 ; , s. 57-73
  • Konferensbidrag (refereegranskat)abstract
    • We show how to extend the Helios voting system to provide eligibility verifiability without revealing who voted which we call private eligibility verifiability. The main idea is that real votes are hidden in a crowd of null votes that are cast by others but are indistinguishable from those of the eligible voter. This extended Helios scheme also improves Helios towards receipt-freeness.
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14423.
  • Kulyk, Oksana, et al. (författare)
  • Introducing Proxy Voting to Helios
  • 2016
  • Ingår i: Proceedings of 2016 11th International Conference on Availability, Reliability and Security, (Ares 2016). - : IEEE. - 9781509009909 ; , s. 98-106
  • Konferensbidrag (refereegranskat)abstract
    • Proxy voting is a form of voting, where the voters can either vote on an issue directly, or delegate their voting right to a proxy. This proxy might for instance be a trusted expert on the particular issue. In this work, we extend the widely studied end-to-end verifiable Helios Internet voting system towards the proxy voting approach. Therefore, we introduce a new type of credentials, so-called delegation credentials. The main purpose of these credentials is to ensure that the proxy has been authorised by an eligible voter to cast a delegated vote. If voters, after delegating, change their mind and want to vote directly, cancelling a delegation is possible throughout the entire voting phase. We show that the proposed extension preserves the security requirements of the original Helios system for the votes that are cast directly, as well as security requirements tailored toward proxy voting.
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14424.
  • Kulyk, Oksana, et al. (författare)
  • Nothing Comes for Free : How Much Usability Can You Sacrifice for Security?
  • 2017
  • Ingår i: IEEE Security and Privacy. - : IEEE. - 1540-7993 .- 1558-4046. ; 15:3, s. 24-29
  • Tidskriftsartikel (refereegranskat)abstract
    • Code voting systems differ in security: some ensure either vote secrecy or vote integrity, while others ensure both. However, these systems potentially impair usability, which might negatively affect voters' attitude toward Internet voting. To determine the tradeoff between usability and security in these systems, the authors conduct a pilot user study examining voters in a university elections setting.
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14425.
  • Kulyk, Oksana, et al. (författare)
  • Sharing Information with Web Services : A Mental Model Approach in the Context of Optional Information
  • 2017
  • Ingår i: Human Aspects of Information Security, Privacy and Trust. - Cham : Springer. ; , s. 675-690
  • Konferensbidrag (refereegranskat)abstract
    • Web forms are a common way for web service providers to collect data from their users. Usually, the users are asked for a lot of information while some items are labeled as optional and others as mandatory. When filling in the web form, users have to decide, which data, often of personal and sensitive nature, they want to share. The factors that influence the decision whether or not to share some information has been studied in the literature in various contexts. However, it is unclear to which extent their results can be transferred to other contexts. In this work we conduct a qualitative user study to verify, whether the reasons for sharing optional information from previous studies [12] are relevant for the context of interacting with a commercial website. We found, that only a few of them were named by the participants of our study.
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14426.
  • Kumar, Divyaratan, et al. (författare)
  • Water-in-Polymer Salt Electrolyte for Long-Life Rechargeable Aqueous Zinc-Lignin Battery
  • 2024
  • Ingår i: Energy & Environmental Materials. - : John Wiley & Sons. - 2575-0356 .- 2575-0348.
  • Tidskriftsartikel (refereegranskat)abstract
    • Zinc metal batteries (ZnBs) are poised as the next-generation energy storage solution, complementing lithium-ion batteries, thanks to their cost-effectiveness and safety advantages. These benefits originate from the abundance of zinc and its compatibility with non-flammable aqueous electrolytes. However, the inherent instability of zinc in aqueous environments, manifested through hydrogen evolution reactions (HER) and dendritic growth, has hindered commercialization due to poor cycling stability. Enter potassium polyacrylate (PAAK)-based water-in-polymer salt electrolyte (WiPSE), a novel variant of water-in-salt electrolytes (WiSE), designed to mitigate side reactions associated with water redox processes, thereby enhancing the cyclic stability of ZnBs. In this study, WiPSE was employed in ZnBs featuring lignin and carbon composites as cathode materials. Our research highlights the crucial function of acrylate groups from WiPSE in stabilizing the ionic flux on the surface of the Zn electrode. This stabilization promotes the parallel deposition of Zn along the (002) plane, resulting in a significant reduction in dendritic growth. Notably, our sustainable Zn-lignin battery showcases remarkable cyclic stability, retaining 80% of its initial capacity after 8000 cycles at a high current rate (1 A g-1) and maintaining over 75% capacity retention up to 2000 cycles at a low current rate (0.2 A g-1). This study showcases the practical application of WiPSE for the development of low-cost, dendrite-free, and scalable ZnBs. A dendrite-free and long-life cycle Zn-lignin battery was demonstrated using water-in-polymer salt electrolyte. 
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14427.
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14428.
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14429.
  • Kumar, Kundan, et al. (författare)
  • Convergence analysis for a conformal discretization of a model for precipitation and dissolution in porous media
  • 2014
  • Ingår i: Numerische Mathematik. - Heidelberg, Germany : Springer. - 0029-599X .- 0945-3245. ; 127:4, s. 715-749
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper we discuss the numerical analysis of an upscaled (core scale) model describing the transport, precipitation and dissolution of solutes in a porous medium. The particularity lies in the modeling of the reaction term, especially the dissolution term, which has a multivalued character. We consider the weak formulation for the upscaled equation and provide rigorous stability and convergence results for both the semi-discrete (time discretization) and the fully discrete schemes. In doing so, compactness arguments are employed.
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14430.
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