In unserem Blog veröffentlichen wir in unregelmäßigen Abständen Artikel zu verschiedenen Themen der IT-Sicherheit, wie z.B. Open Penetrationstests und anderen öffentlichen Gutachten.

Based on the proven expertise in the areas of Single Sign-On and OpenID Connect, our team has been selected to perform an open penetration test of the DENIC ID - an implementation of ID4me.
The scope of the penetration test was to evaluate typical Single Sign-On weaknesses and the impact of novel features implemented in DENIC ID on the security of this login system.


DENIC ID is the first widely-deployed implementation of ID4me ( - a novel protocol for federated identity management. It is based on well-established standards such as OpenID Connect and Domain Name System (DNS). In contrast to other Single Sign-On schemes, ID4me divides the duties of the identity provider into two separated entities: an identity agent and an identity authority. The identity agent provides registration services and manages user data. The identity authority is responsible for user authentication and authorization.