Yes, diki is secure by design - all data is only shared with your friends. There is no central server and especially we do not store your private data. We even don't know that you use our program unless you tell us..

However we have to admit, that in current beta versions we did not implement all of the protections, yet. Therefore we do not recommend our program for sensitive data at the moment. Diki will be secure once we reached the magical version number 0.1.0.