Open Source vs. Closed Source Software: Towards Measuring Security
G. Schryen, R. Kadura, in: 24th Annual ACM Symposium on Applied Computing, 2009.

A comprehensive and comparative analysis of the patching behavior of open source and closed source software vendors
G. Schryen, in: 5th International Conference on IT Security Incident Management \'26; IT Forensics, 2009.

Security of open source and closed source software: An empirical comparison of published vulnerabilities
G. Schryen, in: 15th Americas Conference on Information Systems, 2009.

Effektivität und Effizienz von Anti-Spam-Maßnahmen
G. Schryen, Linux Technical Review (2008).

Practical Security of Large-scale Elections: An Exploratory Case Study of Internet Voting in Estonia
G. Schryen, in: 7th Workshop on E-Business (WEB 2008, AIS Special Interest Group on E-Business), 2008.

Preventing E-mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework
G. Schryen, Preventing E-Mail Spam: The Conceptualization and the Analysis of an Infrastructure Framework, 2007.

A Scalable and Flexible Infrastructure Framework For Addressing Spam
G. Schryen, in: D. Satesh, R. Prabhakar (Eds.), Proceedings of IPSI International Conference on Advances in the Internet, Processing, Systems, and Interdisciplinary Research, ICFAI University Press, Hyderabad, India, 2007, pp. 55–64.

Anti-Spam Measures: Analysis and Design
G. Schryen, Anti-Spam Measures: Analysis and Design, Springer, Berlin, Heidelberg, New York, 2007.

Anti-spam legislation: An analysis of laws and their effectiveness
G. Schryen, Information and Communications Technology Law 16 (2007) 17–32.

Approaches Addressing Spam
G. Schryen, in: D. Satesh, R. Prabhakar (Eds.), Spam: An Introduction, ICFAI University Press, Hyderabad, India, 2007, pp. 41–57.