We’ve created Tutanota, an encrypted email App (GPLv3)

What it does

Take back your data with Tuta's encrypted email, calendar and contacts. We protect your data to the maximum with quantum-safe encryption. The ease and simplicity of our apps lead to an organized workflow. Use the free Tuta Mail apps for Android or iPhone on the go, online and offline. The built-in encryption guarantees that your calendars belong to you alone. Use email invites to quickly manage your meetings and appointments. Tuta calendar push reminders keep your events private on Android, iPhones and iPads. Quick access to your personal appointments, business meetings and repeating tasks. Tuta automatically encrypts all your data end-to-end with post-quantum cryptography which makes it…from tutanota.com

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  TutaCrypt, post-quantum encryption protocols for securing emails [pdf]2024 · tuta.com · ▲15

  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…

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