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Frankfurt am Main, Germany

Schwalm S.,BearingPoint GmbH | Korte U.,Federal Office for Information Security BSI | Huhnlein D.,Ecsec GmbH
Archiving 2014 - Final Program and Proceedings | Year: 2014

Information technology provides the elementary basis for efficient business processes in administration, business and science. Especially important is the preservation of the integrity and authenticity of digital records to maintain the conclusiveness of the documents supporting legal claims of the issuer or third parties and the proof of their correctness in electronic legal and business transactions. To achieve these aims it is required to preserve the evidence of the electronic records. Against this background organizational guidelines and technical mechanisms have been developed and standardized which enable public administrations and private enterprises to preserve the evidence and trustworthiness of their business records over a long period of time. The present contribution provides an overview of the existing and forthcoming standards in this area. © 2014 Society for Imaging Science and Technology. Source


Fischlin M.,TU Darmstadt | Fischlin R.,BearingPoint GmbH
Journal of Cryptology | Year: 2011

Non-malleability protects against man-in-the middle attacks on cryptographic protocols. Non-malleable commitment schemes, for example, assure that a commitment of a message does not help to produce a commitment of a related message. Here we present efficient constructions of such commitment schemes in the common reference string model based on standard assumptions such as RSA, factoring, or discrete logarithm. Our protocols require only three rounds and a few modular exponentiations, and provide statistical or even perfect secrecy of committed values. We also discuss differences between the notion of non-malleable commitment schemes used in previous works by Dolev, Dwork, and Naor and by Di Crescenzo, Ishai, and Ostrovsky. The former definition requires that it is infeasible to find a commitment such that there exists an encapsulated message which is related to another committed value (non-malleability with respect to commitment). The second approach allows the existence of such messages, but then it is hard to find them and to output them in the opening phase (non-malleability with respect to opening). We note that our solutions are of the second type. © 2009 International Association for Cryptologic Research. Source


Krasnova H.,Humboldt University of Berlin | Veltri N.F.,The University of Tampa | Spengler K.,BearingPoint GmbH | Gunther O.,University of Potsdam
Wirtschaftsinformatik | Year: 2013

"Deal of the Day" (DoD) platforms have quickly become popular by offering savings on local services, products and vacations. For merchants, these platforms represent a new marketing channel to advertise their products and services and attract new customers. DoD platform providers, however, struggle to maintaining a stable market share and profitability, because entry and switching costs are low. To sustain a competitive market position, DoD providers are looking for ways to build a loyal customer base. However, research examining the determinants of user loyalty in this novel context is scarce. To fill this gap, this study employs Grounded Theory methodology to develop a conceptual model of customer loyalty to a DoD provider. In the next step, qualitative insights are enriched and validated using quantitative data obtained in a survey with 202 DoD users. We find that customer loyalty is in large part driven by monetary incentives, but can be eroded if impressions from merchant encounter are below expectations. In addition, enhancing the share of deals relevant for consumers, i.e. signal-to-noise ratio, and mitigating perceived risks of a transaction emerge as challenges. Beyond theoretical value, our results offer practical insights into how customer loyalty to a DoD provider can be promoted. © 2013 Springer Fachmedien Wiesbaden. Source


Krasnova H.,Humboldt University of Berlin | Veltri N.F.,The University of Tampa | Spengler K.,BearingPoint GmbH | Gunther O.,University of Potsdam
Business and Information Systems Engineering | Year: 2013

"Deal of the Day" (DoD) platforms have quickly become popular by offering savings on local services, products and vacations. For merchants, these platforms represent a new marketing channel to advertise their products and services and attract new customers. DoD platform providers, however, struggle to maintaining a stable market share and profitability, because entry and switching costs are low. To sustain a competitive market position, DoD providers are looking for ways to build a loyal customer base. However, research examining the determinants of user loyalty in this novel context is scarce. To fill this gap, this study employs Grounded Theory methodology to develop a conceptual model of customer loyalty to a DoD provider. In the next step, qualitative insights are enriched and validated using quantitative data from a survey of 202 DoD users. The authors find that customer loyalty is in large part driven by monetary incentives, but can be eroded if impressions from merchant encounters are below expectations. In addition, enhancing the share of deals relevant for consumers, i.e. signal-to-noise ratio, and mitigating perceived risks of a transaction emerge as challenges. Beyond theoretical value, the results offer practical insights into how customer loyalty to a DoD provider can be promoted. © 2013 Springer Fachmedien Wiesbaden. Source


Zolnowski A.,ISS International Business School of Service Management | Weiss C.,BearingPoint GmbH | Bohmann T.,University of Hamburg
Proceedings of the Annual Hawaii International Conference on System Sciences | Year: 2014

IT is a major driver of business model innovation and servitization. Representations of business models are widely used tools for analyzing instances of these developments as well as for the ideation of novel services and service business models. However, current representations of business models fail to capture essential aspects of service, such as co-creation. In response to these shortcomings, the paper presents a representation for service business models. The utility and efficacy of this alternative business model representation is demonstrated with a case study of a proximity m-payment service in the German retail industry. We apply and compare the Business Model Canvas as well as the Service Business Model Canvas. Based on this application, we present an evaluation by an informed argument of the representation. © 2014 IEEE. Source

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