Kasita

[[Kasita]] is a secure messaging application. It comes out of the same work as [[Intrusion detection over encrypted network data]]: the core algorithm is the same, just pointed at a different problem. Instead of running a detection model over encrypted data, here it protects private conversations.

The privacy model goes further than mainstream messengers. Kasita is end-to-end encrypted, so no one in the middle can read a message. On top of that, the metadata is unreadable too. With our own Private Information Retrieval (#pir) algorithm, the server cannot tell who is talking to whom, how often, or when. That is the part Signal, Threema, and the others leave exposed: they encrypt the message but still see the metadata around it. Kasita does not.

The cryptography is #lattice-based and #post-quantum, so it holds up against a quantum attacker, not just a classical one.

Kasita won the **Post Quantum Innovation Challenge 2018**.