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Hi HN, we are the developers from Tuta (formerly Tutanota), the German end-to-end encrypted email provider, and we recently released the world's first post-quantum encryption for email.
We have included a full technical write-up of the cryptography involved in these changes and we have released it for open public review.
This document specifies TutaCrypt, a protocol designed for hybrid email encryption in Tuta Mail. The protocol combines a classical Elliptic-Curve-Diffie-Hellman key exchange with a post-quantum KEM. The goal is to replace the usage of RSA in Tuta Mail.
In the remainder of this document we describe some preliminaries such as the cryptographic primitives used. We define the core algorithms of the protocol and describe the flow of messages between the communicating parties. Finally, we discuss the security properties and some limitations of the protocol in its current form.
We are eager for your constructive feedback. All cryptography related source code is available for review and experimenting here: https://github.com/tutao/tutanota/blob/master/src/api/worker...
If you have any questions or comments related to post-quantum cryptography please let us know in the comments!