* Conclusion and Future Work

The implementation of Secure Share contributes to the efforts of creating a
privacy protecting peer-to-peer social network. The client API provided as a
library allows for creating various client applications right away, while the
lower layers of the system are worked out.

By implementing psycd as a service for the GNUnet framework, it allows us to
benefit from GNUnet's modular architecture, which can be extended with new or
improved routing schemes in future versions. The DV and mesh service are areas
which need improvement. We need to have proper multicast message distribution in
the network, and the mesh service is a promising candidate for that. It
implements multicast groups, but group encryption still has to be implemented
for this service. Thus improvements on the routing level are necessary to make
the system really scalable and privacy protecting.

As the implementation is still in a prototype stage, further work is needed to
enhance the functionality of the system. Areas that need more work are:

- improve the functionality and usability of the user interface, e.g. add
  dialogs for friendship establishment, and add different interfaces for different
  types of channels, e.g. status updates.
- implement dedicated groups independent of person entities
- user identities should be decoupled from node identities by assigning separate
  keys to users, so they have a master key and subkeys for their devices
- file transfer over PSYC, this requires splitting large packets into smaller
  fragments and reassembling them when receiving
- add UNIX socket support to psycd, as currently only TCP sockets are supported
  for clients
- TLS sockets could be added later as well to enable secure connection to a
  remote node in case a local installation is not available
- make the system work on mobile devices -- this could be done either via
  setting up a GNUnet node on the device or via establishing a TLS connection to
  a remote node; this also requires developing a user interface specifically
  designed for mobile devices
- implement a web interface
- implement testing using the GNUnet testing library