--- _id: '6287' abstract: - lang: eng text: Spamming remains a form of Internet abuse, which burdens the Internet infrastructure, is generally regarded as an annoyance, and is said to cause a huge economic harm. Many technological, organizational, and legislative anti-spam measures have already been proposed and implemented, but have not led to any substantial decrease in the number of spam e-mails. We propose a scalable and flexible infrastructure framework that integrates several anti-spam measures and that features both a technological and an organizational facet. The key element of our infrastructure is a new organizational unit that reliably and transparently limits the number of e-mails that can be sent per day and per account. We also analyze the proposed framework in terms of its theoretical effectiveness, the required resources, and its limitations. author: - first_name: Guido full_name: Schryen, Guido id: '72850' last_name: Schryen citation: ama: 'Schryen G. Preventing E-Mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework.; 2007.' apa: 'Schryen, G. (2007). Preventing E-mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework.' bibtex: '@book{Schryen_2007, title={Preventing E-mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework}, author={Schryen, Guido}, year={2007} }' chicago: 'Schryen, Guido. Preventing E-Mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework, 2007.' ieee: 'G. Schryen, Preventing E-mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework. 2007.' mla: 'Schryen, Guido. Preventing E-Mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework. 2007.' short: 'G. Schryen, Preventing E-Mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework, 2007.' date_created: 2018-12-18T12:50:22Z date_updated: 2022-01-06T07:03:00Z ddc: - '000' department: - _id: '277' file: - access_level: open_access content_type: application/pdf creator: hsiemes date_created: 2018-12-18T13:23:40Z date_updated: 2018-12-18T13:23:40Z file_id: '6322' file_name: anti_spam_framework.pdf file_size: 456755 relation: main_file file_date_updated: 2018-12-18T13:23:40Z has_accepted_license: '1' keyword: - Email - Infrastructure - Internet - Spam language: - iso: eng oa: '1' status: public title: 'Preventing E-mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework' type: report user_id: '61579' year: '2007' ... --- _id: '5655' abstract: - lang: eng text: Spam e-mails have become a serious technological and economic problem. Up to now, by deploying complementary anti-spam measures, we have been reasonably able to withstand spam e-mails and use the Internet for regular communication. However, if we are to avert the danger of losing the Internet e-mail service in its capacity as a valuable, free and worldwide medium of open communication, anti-spam activities should be performed more systematically than is currently the case regarding the mainly heuristic, anti-spam measures in place. A formal framework, within which the existing delivery routes that a spam e-mail may take, and anti-spam measures and their effectiveness can be investigated, will perhaps encourage a shift in methodology and pave the way for new, holistic anti-spam measures. This paper presents a model of the Internet e-mail infrastructure as a directed graph and a deterministic finite automaton and draws on automata theory to formally derive the spam delivery routes. The most important anti-spam measures are then described. Methods controlling only specific delivery routes are evaluated in terms of how effectively they cover the modeled e-mail infrastructure; methods operating independently of any particular routes receive a more general assessment. author: - first_name: Guido full_name: Schryen, Guido id: '72850' last_name: Schryen citation: ama: Schryen G. Do anti-spam measures effectively cover the e-mail communication network? A formal approach. The Journal of Information Systems Security (AIS Special Interest Group in Security). 2007;3(2):66-90. apa: Schryen, G. (2007). Do anti-spam measures effectively cover the e-mail communication network? A formal approach. The Journal of Information Systems Security (AIS Special Interest Group in Security), 3(2), 66–90. bibtex: '@article{Schryen_2007, title={Do anti-spam measures effectively cover the e-mail communication network? A formal approach}, volume={3}, number={2}, journal={The Journal of Information Systems Security (AIS Special Interest Group in Security)}, author={Schryen, Guido}, year={2007}, pages={66–90} }' chicago: 'Schryen, Guido. “Do Anti-Spam Measures Effectively Cover the e-Mail Communication Network? A Formal Approach.” The Journal of Information Systems Security (AIS Special Interest Group in Security) 3, no. 2 (2007): 66–90.' ieee: G. Schryen, “Do anti-spam measures effectively cover the e-mail communication network? A formal approach,” The Journal of Information Systems Security (AIS Special Interest Group in Security), vol. 3, no. 2, pp. 66–90, 2007. mla: Schryen, Guido. “Do Anti-Spam Measures Effectively Cover the e-Mail Communication Network? A Formal Approach.” The Journal of Information Systems Security (AIS Special Interest Group in Security), vol. 3, no. 2, 2007, pp. 66–90. short: G. Schryen, The Journal of Information Systems Security (AIS Special Interest Group in Security) 3 (2007) 66–90. date_created: 2018-11-14T14:51:41Z date_updated: 2022-01-06T07:02:22Z ddc: - '000' department: - _id: '277' extern: '1' file: - access_level: open_access content_type: application/pdf creator: hsiemes date_created: 2018-12-18T13:25:12Z date_updated: 2018-12-18T13:25:12Z file_id: '6324' file_name: Do anti-spam measures effectively cover the e-mail communication - Journal version.pdf file_size: 100448 relation: main_file file_date_updated: 2018-12-18T13:25:12Z has_accepted_license: '1' intvolume: ' 3' issue: '2' keyword: - e-mail - spam - e-mail infrastructure - anti-spam measures - spamming options language: - iso: eng oa: '1' page: 66-90 publication: The Journal of Information Systems Security (AIS Special Interest Group in Security) status: public title: Do anti-spam measures effectively cover the e-mail communication network? A formal approach type: journal_article user_id: '61579' volume: 3 year: '2007' ... --- _id: '5658' abstract: - lang: eng text: '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: - first_name: Guido full_name: Schryen, Guido id: '72850' last_name: Schryen citation: ama: Schryen G. The Impact that Placing Email Addresses on the Internet has on the Receipt of Spam ? An Empirical Analysis. Computers & Security. 2007;2(5):361-372. apa: Schryen, G. (2007). The Impact that Placing Email Addresses on the Internet has on the Receipt of Spam ? An Empirical Analysis. Computers & Security, 2(5), 361–372. bibtex: '@article{Schryen_2007, title={The Impact that Placing Email Addresses on the Internet has on the Receipt of Spam ? An Empirical Analysis}, volume={2}, number={5}, journal={Computers & Security}, publisher={Elsevier}, author={Schryen, Guido}, year={2007}, pages={361–372} }' chicago: 'Schryen, Guido. “The Impact That Placing Email Addresses on the Internet Has on the Receipt of Spam ? An Empirical Analysis.” Computers & Security 2, no. 5 (2007): 361–72.' ieee: G. Schryen, “The Impact that Placing Email Addresses on the Internet has on the Receipt of Spam ? An Empirical Analysis,” Computers & Security, vol. 2, no. 5, pp. 361–372, 2007. mla: Schryen, Guido. “The Impact That Placing Email Addresses on the Internet Has on the Receipt of Spam ? An Empirical Analysis.” Computers & Security, vol. 2, no. 5, Elsevier, 2007, pp. 361–72. short: G. Schryen, Computers & Security 2 (2007) 361–372. date_created: 2018-11-14T14:53:12Z date_updated: 2022-01-06T07:02:22Z ddc: - '000' department: - _id: '277' extern: '1' file: - access_level: open_access content_type: application/pdf creator: hsiemes date_created: 2018-12-18T13:27:01Z date_updated: 2018-12-18T13:27:01Z file_id: '6326' file_name: The Impact that Placing Email Addresses on the Internet has on the Receipt of Spam - An Empirical Analysis - Journal version.pdf file_size: 3026200 relation: main_file file_date_updated: 2018-12-18T13:27:01Z has_accepted_license: '1' intvolume: ' 2' issue: '5' keyword: - Address-obfuscating techniques - email - empirical analysis - honeypot - security by design - security by obscurity - spam language: - iso: eng oa: '1' page: 361-372 publication: Computers & Security publisher: Elsevier status: public title: The Impact that Placing Email Addresses on the Internet has on the Receipt of Spam ? An Empirical Analysis type: journal_article user_id: '61579' volume: 2 year: '2007' ... --- _id: '5661' abstract: - lang: eng text: Spam has become one of the most annoying and costly phenomenon in the Internet. Valid e-mail addresses belong to the most valuable resources of spammers, but little is known about spammers? behavior when collecting and harvesting addresses and spammers? capabilities and interest in carefully directed, consumer-oriented marketing have not been explored yet. Gaining insight into spammers? ways to obtain and (mis)use e-mail addresses is useful in many ways, e.g. for the assessment of the effectiveness of address obscuring techniques and the usability and necessity of hiding e-mail addresses on the Internet. This paper presents a spam honeypot project in progress addressing these issues by systematically placing e-mail addresses in the Internet and analyzing received e-mails. The honeypot?s conceptual framework, its implementation, and first empirical results are presented. Finally, an outlook on further work and activities is provided. author: - first_name: Guido full_name: Schryen, Guido id: '72850' last_name: Schryen citation: ama: 'Schryen G. An e-mail honeypot addressing spammers’ behavior in collecting and applying addresses. In: Proceedings of the 6th IEEE Information Assurance Workshop. Westpoint; 2005:37-41.' apa: Schryen, G. (2005). An e-mail honeypot addressing spammers’ behavior in collecting and applying addresses. In Proceedings of the 6th IEEE Information Assurance Workshop (pp. 37–41). Westpoint. bibtex: '@inproceedings{Schryen_2005, title={An e-mail honeypot addressing spammers’ behavior in collecting and applying addresses}, booktitle={Proceedings of the 6th IEEE Information Assurance Workshop}, publisher={Westpoint}, author={Schryen, Guido}, year={2005}, pages={37–41} }' chicago: Schryen, Guido. “An E-Mail Honeypot Addressing Spammers’ Behavior in Collecting and Applying Addresses.” In Proceedings of the 6th IEEE Information Assurance Workshop, 37–41. Westpoint, 2005. ieee: G. Schryen, “An e-mail honeypot addressing spammers’ behavior in collecting and applying addresses,” in Proceedings of the 6th IEEE Information Assurance Workshop, 2005, pp. 37–41. mla: Schryen, Guido. “An E-Mail Honeypot Addressing Spammers’ Behavior in Collecting and Applying Addresses.” Proceedings of the 6th IEEE Information Assurance Workshop, Westpoint, 2005, pp. 37–41. short: 'G. Schryen, in: Proceedings of the 6th IEEE Information Assurance Workshop, Westpoint, 2005, pp. 37–41.' date_created: 2018-11-14T14:55:48Z date_updated: 2022-01-06T07:02:24Z ddc: - '000' department: - _id: '277' extern: '1' file: - access_level: open_access content_type: application/pdf creator: hsiemes date_created: 2018-12-18T13:31:41Z date_updated: 2018-12-18T13:31:41Z file_id: '6331' file_name: Schryen - An e-mail honeypot addressing spammers' behavior in collecting and applying addresses.pdf file_size: 119362 relation: main_file file_date_updated: 2018-12-18T13:31:41Z has_accepted_license: '1' keyword: - Spam - ham - e-mail - honeypot - address obscuring technique - address taxonomy language: - iso: eng oa: '1' page: 37-41 publication: Proceedings of the 6th IEEE Information Assurance Workshop publisher: Westpoint status: public title: An e-mail honeypot addressing spammers' behavior in collecting and applying addresses type: conference user_id: '61579' year: '2005' ... --- _id: '5662' abstract: - lang: eng text: Spam als unerwünschte Massen-E-Mail hat die Grenze von der Belästigung zur ökonomischen Relevanz längst überschritten. Ihr relativer Anteil am gesamten, weltweiten E-Mail-Aufkommen stieg in den vergangenen Jahren auf mehr als 50% im Jahr 2003. Es entstehen jährlich volkswirtschaftliche Schäden in Milliardenhöhe. Zur Bekämpfung des Spam-Problems werden neben gesetzlichen Regelungen vor allem technische Lösungen eingesetzt, bei denen das Blockieren und Filtern von E-Mails in praktisch eingesetzten Anti-Spam-Systemen dominieren. Dieser Artikel führt in die Spam-Problematik ein und beschreibt, bewertet und klassifiziert die derzeit bedeutendsten Verfahren zur Bekämpfung von Spam. author: - first_name: Guido full_name: Schryen, Guido id: '72850' last_name: Schryen citation: ama: Schryen G. Effektivität von Lösungsansätzen zur Bekämpfung von Spam. Wirtschaftsinformatik. 2004;46(4):281-288. apa: Schryen, G. (2004). Effektivität von Lösungsansätzen zur Bekämpfung von Spam. Wirtschaftsinformatik, 46(4), 281–288. bibtex: '@article{Schryen_2004, title={Effektivität von Lösungsansätzen zur Bekämpfung von Spam}, volume={46}, number={4}, journal={Wirtschaftsinformatik}, publisher={Springer}, author={Schryen, Guido}, year={2004}, pages={281–288} }' chicago: 'Schryen, Guido. “Effektivität von Lösungsansätzen Zur Bekämpfung von Spam.” Wirtschaftsinformatik 46, no. 4 (2004): 281–88.' ieee: G. Schryen, “Effektivität von Lösungsansätzen zur Bekämpfung von Spam,” Wirtschaftsinformatik, vol. 46, no. 4, pp. 281–288, 2004. mla: Schryen, Guido. “Effektivität von Lösungsansätzen Zur Bekämpfung von Spam.” Wirtschaftsinformatik, vol. 46, no. 4, Springer, 2004, pp. 281–88. short: G. Schryen, Wirtschaftsinformatik 46 (2004) 281–288. date_created: 2018-11-14T14:56:51Z date_updated: 2022-01-06T07:02:24Z ddc: - '000' department: - _id: '277' extern: '1' file: - access_level: open_access content_type: application/pdf creator: hsiemes date_created: 2018-12-18T13:36:34Z date_updated: 2018-12-18T13:36:34Z file_id: '6338' file_name: Verlagsversion Guido_Schryen__281__288.pdf file_size: 288686 relation: main_file file_date_updated: 2018-12-18T13:36:34Z has_accepted_license: '1' intvolume: ' 46' issue: '4' keyword: - Spam - E-Mail - Spoofing - Blockieren - Filtern - Lightweight Mail Transfer Agent Authentication Protocol (LMAP) language: - iso: eng oa: '1' page: 281-288 publication: Wirtschaftsinformatik publisher: Springer status: public title: Effektivität von Lösungsansätzen zur Bekämpfung von Spam type: journal_article user_id: '61579' volume: 46 year: '2004' ... --- _id: '5663' abstract: - lang: eng text: Spam as unsolicited e-mail to a large number of recipients is known to ecome an increasingly disturbing and costly issue of electronic business and internet traffic. Mainly technical-oriented approaches are applied with a focus on blocking, filtering, and authentication mechanisms based on the domain name system. They come along with different drawbacks and have all low effectiveness in common. The article sketches these approaches, shows its limitations, and proposes an account-based approach where the number of e-mails per day and account is restricted. author: - first_name: Guido full_name: Schryen, Guido id: '72850' last_name: Schryen citation: ama: 'Schryen G. Fighting Spam: Motivating an Account-based Approach. In: Isaias P, ed. Proceedings of the IADIS International Conference WWW/Internet 2004. Vol. 2. Madrid: IADIS Press; 2004:937-940.' apa: 'Schryen, G. (2004). Fighting Spam: Motivating an Account-based Approach. In P. Isaias (Ed.), Proceedings of the IADIS International Conference WWW/Internet 2004. vol. 2 (pp. 937–940). Madrid: IADIS Press.' bibtex: '@inproceedings{Schryen_2004, place={Madrid}, title={Fighting Spam: Motivating an Account-based Approach}, booktitle={Proceedings of the IADIS International Conference WWW/Internet 2004. vol. 2}, publisher={IADIS Press}, author={Schryen, Guido}, editor={Isaias, PedroEditor}, year={2004}, pages={937–940} }' chicago: 'Schryen, Guido. “Fighting Spam: Motivating an Account-Based Approach.” In Proceedings of the IADIS International Conference WWW/Internet 2004. Vol. 2, edited by Pedro Isaias, 937–40. Madrid: IADIS Press, 2004.' ieee: 'G. Schryen, “Fighting Spam: Motivating an Account-based Approach,” in Proceedings of the IADIS International Conference WWW/Internet 2004. vol. 2, 2004, pp. 937–940.' mla: 'Schryen, Guido. “Fighting Spam: Motivating an Account-Based Approach.” Proceedings of the IADIS International Conference WWW/Internet 2004. Vol. 2, edited by Pedro Isaias, IADIS Press, 2004, pp. 937–40.' short: 'G. Schryen, in: P. Isaias (Ed.), Proceedings of the IADIS International Conference WWW/Internet 2004. Vol. 2, IADIS Press, Madrid, 2004, pp. 937–940.' date_created: 2018-11-14T14:59:03Z date_updated: 2022-01-06T07:02:25Z ddc: - '000' department: - _id: '277' editor: - first_name: Pedro full_name: Isaias, Pedro last_name: Isaias extern: '1' file: - access_level: open_access content_type: application/pdf creator: hsiemes date_created: 2018-12-18T13:33:30Z date_updated: 2018-12-18T13:33:30Z file_id: '6333' file_name: Fighting Spam_Motivating an account-based approach.pdf file_size: 46083 relation: main_file file_date_updated: 2018-12-18T13:33:30Z has_accepted_license: '1' keyword: - e-mail - spam - filtering - blocking - LMAP - SMTP account language: - iso: eng oa: '1' page: 937-940 place: Madrid publication: Proceedings of the IADIS International Conference WWW/Internet 2004. vol. 2 publisher: IADIS Press status: public title: 'Fighting Spam: Motivating an Account-based Approach' type: conference user_id: '61579' year: '2004' ...