With the proof of concept, the basic feasibility of the idea of an extension of an established OSN by a secure data exchange should be proven. Within the framework of this thesis, the task was to provide the proof of concept as a native Android app. With regard to the architecture, the focus from the beginning was on a peer 2 peer solution, which is why a solution with its own additional servers was not pursued further in the development of the prototype. Furthermore, an interface should be available for the service provider of the OSN, through which anonymized information can be obtained from the privately exchanged data.

Even though the implementation by add-on, as shown in the previous chapter as a possible solution strategy, was thus fundamentally ruled out, the decisions were nevertheless based on considerations as to how users of such an extension could also be part of the P2P network.

Since it is only a proof of concept, the mapping of the complete functionality of the OSN was not in the foreground. But, again, this was taken into account by considerations and decisions, how for example data formats can be arranged so flexibly that every functionality can be mapped.

In addition, the focus was on compliance with the quality objectives and implementation of the functional and non-functional requirements as defined in the previous chapter. How well this has been achieved will be evaluated in the following chapters for evaluation and subsequent discussion.