@article{5658,
  abstract     = {{Email communication is encumbered with a mass of email messages which their recipients have neither requested nor require. Even worse, the impacts of these messages are far from being simply an annoyance, as they also involve economic damage. This manuscript examines the resource ?email addresses?, which is vital for any potential bulk mailer and spammer. Both a methodology and a honeypot conceptualization for implementing an empirical analysis of the usage of email addresses placed on the Internet are proposed here. Their objective is to assess, on a quantitative basis, the extent of the current harassment and its development over time. This ?framework? is intended to be extensible to measuring the effectiveness of address-obscuring techniques. The implementation of a pilot honeypot is described, which led to key findings, some of them being: (1) Web placements attract more than two-thirds (70\%) of all honeypot spam emails, followed by newsgroup placements (28.6\%) and newsletter subscriptions (1.4\%), (2) the proportions of spam relating to the email addresses? top-level domain can be statistically assumed to be uniformly distributed, (3) More than 43\% of addresses on the web have been abused, whereas about 27\% was the case for addresses on newsgroups and only about 4\% was the case for addresses used for a newsletter subscription, (4) Regarding the development of email addresses? attractiveness for spammers over time, the service ?web sites? features a negative linear relationship, whereas the service ?Usenet? hows a negative exponential relationship. (5) Only 1.54\% of the spam emails showed an interrelation between the topic of the spam email and that of the location where the recipient?s address was placed, so that spammers are assumed to send their emails in a ?context insensitive? manner. The results of the empirical analysis motivate the need for the protection of email addresses through obscuration. We analyze this need by formulating requirements for address obscuring techniques and we reveal to which extent today?s most relevant approaches fulfill these requirements.}},
  author       = {{Schryen, Guido}},
  journal      = {{Computers & Security}},
  keywords     = {{Address-obfuscating techniques, email, empirical analysis, honeypot, security by design, security by obscurity, spam}},
  number       = {{5}},
  pages        = {{361--372}},
  publisher    = {{Elsevier}},
  title        = {{{The Impact that Placing Email Addresses on the Internet has on the Receipt of Spam ? An Empirical Analysis}}},
  volume       = {{2}},
  year         = {{2007}},
}

@techreport{14941,
  author       = {{Maiterth, Ralf and Sureth-Sloane, Caren}},
  title        = {{{Aufkommenswirkungen des Erbschaftsteuerreformvorschlags der CDU/CSU-Mittelstandsvereinigung}}},
  year         = {{2007}},
}

@article{14942,
  author       = {{Müller, Jens}},
  journal      = {{FinanzBetrieb}},
  pages        = {{415--426}},
  title        = {{{Die steuerliche Ungleichbehandlung von Anteilen an Kapitalgesellschaften}}},
  volume       = {{9}},
  year         = {{2007}},
}

@techreport{14943,
  author       = {{Müller, Heiko and Sureth-Sloane, Caren}},
  title        = {{{Group Simulation and Income Tax Statistics - How Big is the Error?}}},
  volume       = {{24}},
  year         = {{2007}},
}

@techreport{14944,
  author       = {{Müller, Jens}},
  title        = {{{Die Fehlbewertung durch das Stuttgarter Verfahren - eine Sensitivitätsanalyse der Werttreiber von Steuer- und Marktwerten}}},
  volume       = {{25}},
  year         = {{2007}},
}

@inbook{14945,
  author       = {{Sureth-Sloane, Caren}},
  booktitle    = {{Festzeitschrift zur Emeritierung von Reinar Lüdeke: Regeln rationaler Finanzpolitik und ihre Anwendung}},
  editor       = {{Allinger, Hanjo and Beckmann, Klaus}},
  pages        = {{153--190}},
  publisher    = {{Andrássy Gyula Deutschsprachige Universität Budapest}},
  title        = {{{Investitionswirkungen von Übergangsregelungen bei Steuerreformen}}},
  year         = {{2007}},
}

@book{13202,
  editor       = {{Krallmann, Hermann and Schönherr, Marten and Trier, Matthias}},
  isbn         = {{978-3486584462}},
  title        = {{{Systemanalyse im Unternehmen - Prozessorientierte Methoden der Wirtschaftsinformatik}}},
  year         = {{2007}},
}

@book{13314,
  author       = {{Trier, Matthias}},
  isbn         = {{3836415402, 9783836415408}},
  publisher    = {{VDM Verlag}},
  title        = {{{Virtual Knowledge Communities - IT-supported Visualization and Analysis}}},
  year         = {{2007}},
}

@inbook{13315,
  author       = {{Aier, Stephan and Haarlaender, Nico}},
  booktitle    = {{Systemanalyse im Unternehmen : Prozessorientierte Methoden der Wirtschaftsinformatik}},
  editor       = {{Krallmann, Hermann and Schoenherr, Marten and Trier, Matthias}},
  pages        = {{229--248}},
  publisher    = {{Oldenbourg}},
  title        = {{{Systemanalyse zur Verbesserung von Geschäftsprozessen}}},
  volume       = {{5., vollst. überarb. Aufl.}},
  year         = {{2007}},
}

@inproceedings{13355,
  author       = {{Herzog, Michael A. and Trier, Matthias}},
  booktitle    = {{Proceedings Wirtschaftsinformatik 2007}},
  pages        = {{21--38}},
  publisher    = {{Karlsruher Universitätsverlag}},
  title        = {{{Generische Transformation von Learning-Content - Das MOCCA-Projekt}}},
  volume       = {{2}},
  year         = {{2007}},
}

@inproceedings{13357,
  author       = {{Trier, Matthias and Bobrik, Annette and Bartels, Tilmann}},
  booktitle    = {{Proceedings Wirtschaftsinformatik 2007}},
  pages        = {{593--610}},
  publisher    = {{Karlsruher Universitätsverlag}},
  title        = {{{Towards Understanding the Dynamics of Digital Communication Networks}}},
  volume       = {{2}},
  year         = {{2007}},
}

@inproceedings{13362,
  author       = {{Luther, Michael and Trier, Matthias}},
  booktitle    = {{Proceedings Wirtschaftsinformatik 2007}},
  pages        = {{779--794}},
  publisher    = {{Karlsruher Universitätsverlag}},
  title        = {{{Ein Ansatz zur prozessorientierten Evaluation von Learning Management Systemen}}},
  volume       = {{2}},
  year         = {{2007}},
}

@inproceedings{13367,
  abstract     = {{IRIS (Information Systems Research in Scandinavia) Conference is an annual meeting for researchers in Scandinavia. Through 29 annual conference meetings a social network of co-authorships and general research collaboration has emerged. This article contributes a historical reflection and analysis of the social network of researchers associated with the IRIS in the period from 1978 to 2006. We make use of the network visualization and analysis tool called Commetrix. We will examine the influence of certain researchers in this network by identifying their betweenness centrality and degree centrality. We will reflect on the nature and characteristic of the research topics by analyzing the network of keywords found in the conference paper titles, and visualizing their representation in the network.}},
  author       = {{Molka-Danielsen, Judith and Trier, Matthias and Shlyk, Vadim and Bobrik, Annette and Nurminen, Markku I.}},
  booktitle    = {{Proceedings of IRIS30, Tampere, 2007}},
  pages        = {{968--992}},
  title        = {{{IRIS (1978-2006) Historical Reflection through Visual Analysis}}},
  year         = {{2007}},
}

@inbook{13370,
  author       = {{Trier, Matthias}},
  booktitle    = {{Content Engineering}},
  editor       = {{Herzog, Michael A.}},
  pages        = {{33--52}},
  publisher    = {{GITO Verlag}},
  title        = {{{Content und Kommunikation: Von der Dichotomie zur Kombination}}},
  year         = {{2007}},
}

@inbook{13379,
  author       = {{Trier, Matthias and Bobrik, A.}},
  booktitle    = {{Systemanalyse im Unternehmen - Prozessorientierte Methoden der Wirtschaftsinformatik}},
  editor       = {{Krallmann , Hermann and Schönherr, Marten and Trier, Matthias}},
  publisher    = {{Oldenbourg Verlag}},
  title        = {{{Systemanalyse im Wissensmanagement }}},
  year         = {{2007}},
}

@inbook{13380,
  author       = {{Krallmann, Hermann and Trier, Matthias}},
  booktitle    = {{Systemanalyse im Unternehmen - Prozessorientierte Methoden der Wirtschaftsinformatik}},
  editor       = {{Krallmann, Hermann and Schönherr, Marten and Trier, Matthias}},
  keywords     = {{Prozessorientierung Systemanalyse Wirtschaftsinformatik ITeG_233}},
  publisher    = {{Oldenbourg Verlag}},
  title        = {{{Systemanalyse}}},
  year         = {{2007}},
}

@inbook{13381,
  author       = {{Trier, Matthias and Bobrik, A. and Neumann, N. and Wyssussek, B.}},
  booktitle    = {{Systemanalyse im Unternehmen – Prozessorientierte Methoden in der Wirtschaftsinformatik}},
  editor       = {{Krallmann, Hermann and Schönherr, Marten and Trier, Matthias}},
  publisher    = {{Oldenbourg Verlag}},
  title        = {{{Systemtheorie und Modell}}},
  year         = {{2007}},
}

@inbook{13382,
  author       = {{Bobrik, A. and Trier, Matthias}},
  booktitle    = {{Systemanalyse im Unternehmen – Prozessorientierte Methoden in der Wirtschaftsinformatik}},
  editor       = {{Krallmann, Hermann and Schönherr, Marten and Trier, Matthias}},
  publisher    = {{Oldenbourg Verlag}},
  title        = {{{Modellüberblick}}},
  year         = {{2007}},
}

@inbook{13383,
  author       = {{Frank, H. and Trier, Matthias}},
  booktitle    = {{Systemanalyse im Unternehmen – Prozessorientierte Methoden in der Wirtschaftsinformatik}},
  editor       = {{Krallmann, Hermann and Schönherr, Marten and Trier, Matthias}},
  publisher    = {{Oldenbourg Verlag}},
  title        = {{{Projektmanagement}}},
  year         = {{2007}},
}

@inbook{13384,
  author       = {{Bobrik, A. and Trier, Matthias}},
  booktitle    = {{Analyse sozialer Netzwerke und Social Software - Grundlagen und Anwendungsbeispiele}},
  editor       = {{Müller, Claudia and Gronau, Norbert}},
  publisher    = {{Gito Verlag}},
  title        = {{{IT-gestützte Visualisierung und Analyse von virtuellen Kontaktnetzwerken -  Anwendungsfelder, Methodik und Vorteile}}},
  year         = {{2007}},
}