[Tutanota]

Our core development team are trained to work in applied cryptography and we work directly with the University of Wuppertal cryptographers for cryptanalysis and testing.

To secure our customer's emails we do not only rely on the new post-quantum algorithm but we use a post-quantum Key Encapsulation Mechanism (CRYSTALS-Kyber) in combination with an Elliptic-Curve-Diffie-Hellmann key exchange (x25519). We did choose Kyber for pq encryption because it has been chosen by NIST for standardization. However, we are aware that it still might be broken in the future. In this case our implementation allows us to replace it with a different post-quantum Key Encapsulation Mechanism. Our customer's emails will not be leaked in this case because they are still protected by the state-of-the-art Elliptic-Curve-Diffie-Hellmann key exchange.