PKI and Entitlement - Key Information Security Management Solutions for Business and IT Compliance. - Guido von der Heidt; Reinhard Schoepf (ISSE, 2007)

Development and Implementation of an Encryption Strategy for a global Enterprise. - Guido von der Heidt (ISSE, 2008)

Secure E-Mail Communication across Company Boundaries Experiences and Architectures. - Markus Wichmann; Guido von der Heidt; Carsten Hille; Gunnar Jacobson (ISSE, 2009)