1. Abe, T., Itoh, H., Takahashi, K. (2007): SASSO – Implementing Identity Provider on Mobile Phone. Workshop on Digital Identity Management (DIM)
2. Adams, C., Lloyd, S. (2002): Understanding PKI – Concepts, Standards, and Deployment Considerations. 2nd ed. Addison-Wesley
3. Gerck, E. (1998): Overview of Certification Systems: X.509, CA, PGP and SKIP
4. Hardt, D. (2005): Präsentation zu Identity 2.0. Video-Datei, http://identity20.com/media/OSCON2005/
5. ISO/IEC 24760: ISO/IEC 5th Working Draft 24760 – Information technology – Security techniques – A framework for identity management, 2008-09-15