TutaCrypt, post-quantum encryption protocols for securing emails [pdf]
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…
TutaCrypt, post-quantum encryption protocols for securing emails [pdf] launched on March 18, 2024 with 15 votes, #1,239 of 4,270 launches that month and more than 75% of that year's launches. The site was not reachable when checked in September 2026.
In plain words
TutaCrypt is a post-quantum encryption protocol developed by Tuta, a German end-to-end encrypted email provider. The protocol secures emails by combining classical Elliptic-Curve-Diffie-Hellman key exchange with post-quantum cryptography to replace RSA encryption. It is designed for anyone using Tuta Mail who needs protection against future quantum computing threats. The protocol has been released for open public review with full technical documentation of the cryptographic methods involved.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
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…
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Hi HN, we have recently completed a research project on how to encrypt emails with post-quantum secure algorithms as well as Forward Secrecy. We'd love to hear your feedback and discuss technical issues. The paper can be found here: https://eprint.iacr.org/2021/875
filippo.io/mlkem768 – Post-Quantum Cryptography for the Go Ecosystem2024 · words.filippo.io · ▲315filippo.io/mlkem768 is a pure-Go implementation of the post-quantum key exchange mechanism ML-KEM-768 optimized for correctness and readability.
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Forward Email – Open-Source Quantum Safe Encrypted Email Service2023 · forwardemail.net · ▲35Get free email forwarding for custom domains. Send & receive as [email protected] with unlimited aliases, 10GB storage, IMAP/POP3/SMTP & 100% open-source security. Trusted by 500K+ users. Setup in 2 minutes.
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