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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.


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.


Gerpott T.J.,University of Duisburg - Essen | Thomas S.,BearingPoint GmbH
Telecommunications Policy | Year: 2014

This paper reviews 175 scholarly empirical publications on mobile Internet (MI) usage intensity levels and potential determinants of respective usage behavior at the individual subscriber level. Based on an overview of MI measurement approaches and units evidence on the development of the average MI data volume generated per subscriber over the last years is summarized. Interindividual variance in MI usage was found to be very large. This raises the question which factors contribute to explaining MI usage differences. A qualitative review and a meta-analysis of correlations between 22 variables grouped into four categories (country, personal user characteristics, MI attribute perceptions/behavioral intentions and factual use conditions) on the one side and MI usage criteria on the other were carried out. Enjoyment, behavioral intention to use MI, educational level, subscription of a flat rate and ease of use turned out to be the five antecedents with the largest sample size- and measurement error-corrected average correlations r̄a with MI usage criteria. Moderator analysis indicated that the approach to measuring MI usage behaviors (subjective versus objective) and geographic origin of a sample (Asia versus Europe/USA) significantly altered relationships between a number of predictors and MI usage. Specifically, mono-method work which measures both explanatory factors and MI usage in one questionnaire was prone to overestimate relationships between independent study variables and self-reports of MI usage. The review derives open research issues in three territories, namely measurement of MI usage, choice of MI usage determinants as well as study sampling and design. © 2013 Elsevier Ltd.


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.


Gerpott T.J.,University of Duisburg - Essen | Thomas S.,BearingPoint GmbH | Weichert M.,Vodafone
Telematics and Informatics | Year: 2013

Prior research on adopters of ubiquitous Internet access via cellular radio infrastructures of mobile network operators (MNO) has primarily focused on consumers equipped with enhanced web-enabled phones. In contrast, this work investigates personal characteristics and mobile Internet (MI) use behaviors of consumers who chose computer-centric appliance types for MI access. Two variants of tablet PCs (Apple's iPad1 and iPad2) and laptops are distinguished as computer-centric communication device categories. Data on two demographic variables, three MNO relationship characteristics and actual MI use intensity (average monthly volume of mobile IP traffic generated by a subscriber in May and June 2011) of 2001 consumers with a flat MI pricing scheme were extracted from customer files of the German subsidiary of a large international MNO. 1371, 367 and 263 of the sample members used an iPad1, an iPad2 and a laptop, respectively for MI access. Compared to the adult population in Germany, persons aged between 17 and 35 years and males are overrepresented among MI adopters with the three studied device types. MI use intensity is highly positively skewed: in each of the three appliance groups, a small number of users disproportionately contributes to the total MI traffic generated by the subjects. MI use intensity is the main variable discriminating between Apple tablet versus laptop MI subscribers. On average, laptop users generate three times more MI traffic than iPad customers. MI use intensity does not differ significantly between iPad1 and iPad2 customers. Age and length of business relationship with the collaborating MNO are the two only studied personal characteristics, which consistently display a significant (negative) association with MI use intensity across the three appliance groups. Conclusions are drawn for MNO on aligning marketing measures to the peculiarities of users with different types of computer-centric MI devices and for scholarly research seeking to enhance the understanding of the influence of various appliance categories on MI adoption and use behaviors. © 2012 Elsevier Ltd. All rights reserved.


Gerpott T.J.,University of Duisburg - Essen | Thomas S.,BearingPoint GmbH | Weichert M.,Vodafone
Telecommunications Policy | Year: 2013

This work explores personal characteristics and mobile Internet (MI) use behaviors of consumers equipped with four distinct types of advanced handsets for accessing the Internet via cellular radio infrastructures of mobile network operators (MNO). Furthermore, it investigates the extent to which personal and mobile appliance characteristics explain variance in actual MI use intensity. Data on two demographic variables, three MNO relationship characteristics and actual MI use intensity (average monthly volume of mobile IP traffic generated by a subscriber in May and June 2011) of 9321 adult consumers with a flat MI pricing scheme are extracted from customer files of the German subsidiary of a large international MNO. 959, 2213, 2410 and 3739 of the sample members use an Apple iPhone 3, an Apple iPhone 4, a model running with Google's Android operating system (OS) and other Ml-enabled mobile OS/phone types, respectively. Compared to the adult population in Germany, persons at least 50 years of age are clearly underrepresented among MI adopters with the four studied device types. Differences between the four phone type groups with regard to gender, age, time from enrollment and MI use experience emerge as statistically significant, but they achieve only minor substantial relevance. MI use intensity is highly positively skewed: In each of the four appliance groups, a small number of users disproportionately add to the total MI traffic generated by the subjects. Consumers' advanced OS/handset type strongly contributes towards explaining MI use intensity variance. iPhone subscribers generate more traffic than Android customers who in turn show a higher MI activity level than individuals running other web-enabled mobile models. Age is the only studied personal characteristic consistently showing a (negative) association with MI usage, which both is statistically and materially significant. Conclusions are drawn for MNO on MI marketing issues. Implications of study limitations for research on MI adoption and use behaviors on the MI are also outlined. © 2012 Elsevier Ltd.


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.


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.


Kirchhof P.,BearingPoint GmbH | Meseth N.,Deloitte
Proceedings - Winter Simulation Conference | Year: 2012

This paper reports on the results of a survey conducted among German healthcare institutions to collect data about the use of simulation in the respective field. The setup follows a survey published in Greasley (2008). One goal of the survey was to assess how many institutions have used simulation as a decision making tool before, and if they plan to do so in the future. Another focus are the potential reasons against the use of simulation, which are grouped into the categories costs, awareness, skills & experience, organizational-, and technical obstacles. The results indicate that while the use of simulation in German healthcare is low, costs are the main reason against a wider adoption. Following are lack of awareness among decision makers, and a lack of skills within the internal staff. An alleged negative reputation of simulation could not be confirmed. © 2012 IEEE.


Gerpott T.J.,University of Duisburg - Essen | Thomas S.,BearingPoint GmbH | Weichert M.,Vodafone
Information Systems Frontiers | Year: 2014

Past scholarly empirical work on consumption interrelationships between various categories of mobile network operator (MNO) services is mainly limited to established short message service (SMS) and voice calling. Research exploring the interplay between the consumption levels of these two MNO-provided services and the use intensity of the novel offering to access the Internet via cellular radio infrastructures (= mobile Internet [MI]) is scarce. This gap is addressed in the present article. Based on a review of theoretical perspectives on consumption relationships across mobile services a positive interdependence between the use intensities of the two traditional services and MI access is hypothesized. In addition, supplementary hypotheses and research questions on associations between personal background characteristics, device type and MI adoption time of cell customers on the one side and levels of SMS and voice service usage on the other are developed. "System-captured" measures on individual real service consumption behaviors and the remaining study variables are extracted from customer and billing data archives of the German subsidiary of a large international MNO. Regression analysis of data from 8,312 customers of this MNO indicates that MI use intensity (average monthly volume of mobile IP traffic generated by a subscriber in May and June 2011) is positively related to monthly number of SMS sent and outbound mobile voice minutes. The interrelationships are highly statistically significant but the absolute effect sizes are merely of "small" relevance. Age and male gender are strongly negatively related to SMS consumption. Subscription to an unmetered tariff scheme for SMS and voice has substantial influence both on SMS sent and outgoing voice minutes. SMS use intensity appears to be less price sensitive than outgoing voice minute quantities. The study variables explain only a negligibly small proportion of variance in incoming voice minutes. Practical implications for MNO and directions for future research are discussed. © 2012 Springer Science+Business Media, LLC.

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