Proton Mail now offers post-quantum encryption as an optional feature, helping users protect emails against future quantum computing threats.
Proton has taken a significant step toward the future of cybersecurity by introducing post-quantum encryption support in Proton Mail. While quantum computers are not yet capable of breaking today’s encryption systems, the company is preparing users for a future where that may change.
Post-quantum encryption is now available as an optional feature across all Proton Mail plans — including free accounts — allowing users to enhance the security of their communications against both current and emerging threats.
Traditional email encryption relies on established cryptographic methods such as RSA and elliptic curve cryptography (ECC). These systems remain secure against conventional computing power today. However, advances in quantum computing — particularly techniques like Shor’s algorithm — could eventually undermine these protections.
With the new update, Proton Mail enables users to generate encryption keys designed to resist quantum-based attacks. This means:
The update ensures that enhanced security can be adopted gradually without disrupting current workflows.
As part of this rollout, Proton Mail is also expanding support for OpenPGP v6 — a more advanced framework that accommodates modern cryptographic algorithms, including post-quantum methods.
Importantly, Proton is not limiting these advancements to its own ecosystem. The company is working with broader open-source initiatives, including Mozilla Thunderbird, to promote compatibility across email providers. This approach aims to make quantum-safe communication accessible beyond a single platform.
Although practical quantum attacks are not yet a reality, security experts warn of a “harvest now, decrypt later” scenario. In this model, attackers collect encrypted data today with the intention of decrypting it in the future once quantum technology matures.
This long-term risk is driving early adoption of post-quantum cryptography across the tech industry. Organizations that delay transitioning may find themselves exposed when the technology becomes viable.
By integrating post-quantum encryption today, Proton is positioning itself ahead of a major shift in cybersecurity. The move reflects a broader industry trend: preparing for threats before they become immediate risks.
For users, the update offers a simple way to strengthen email privacy without sacrificing usability — ensuring that sensitive communications remain protected both now and in the years ahead.
Users can activate post-quantum encryption directly within Proton Mail settings. The feature is optional and can be enabled in just a few steps, making advanced security accessible even to non-technical users.
