At Tuta, we are proud to be at the forefront of the transition to post-quantum encryption for email which we introduced already in 2024. This makes us the first email provider to enable people and businesses to send and receive emails that are protected with conventional and post-quantum algorithms in a hybrid protocol.

We’re proud to offer this unique level of security in the encrypted email market, and to celebrate World Quantum Day, you can now try Revolutionary and Legend one month for free when upgrading until the end of April 2025.

Turn ON Privacy in one click.

1 month free!

Quantum computing: from theory to reality

But now let’s look at quantum computing!

Quantum computing has been around since the early 1990s, but initially the progress in quantum computing was incredibly slow. From the very first 2-qubit processor published in 1998, it took more than two decades to scale quantum computing to 100 qubits.

But in recent years, development speed has increased significantly, and breakthrough in quantum computing has appeared on the horizon. Lately, one big tech after the other has published their – in parts very different – approaches and progresses made in quantum computing.

• IBM’s Condor, published in 2023

• Google’s Willow, published in 2024

• Microsoft’s Majorana-1, published in 2025

• Amazon’s Ocelot, published in 2025

While except from IBM’s Condor all of these quantum processors are early demonstrators, the leaps made in quantum development get increasingly larger. The aim of the demonstrators is to find ways to keep the qubits stable for longer times and to reduce the error rate (which is still the biggest problem in quantum research) to finally be able to scale the quantum processors to larger scales to run complex computational tasks – tasks that are yet too complex and/or would take too much time to run on conventional computers.

In addition to big tech, governments around the world - including the U.S., China, and the EU - are ramping up their R&D budgets for quantum computing, making the probability of a quantum breakthrough in the near future ever more likely.

Development of quantum computing from 1995 to 2025 (graph): Quantum computing is being developed by Big Tech: IBM, Google, Amazon, and Microsoft fight for quantum supremacy and invest millions to be the first to own this technology. That’s why we need to switch to quantum-safe encryption now!

Risks of quantum computing

These advancements bring not only exciting possibilities for technology, science, medicine,and more, but also significant implications for cybersecurity. Powerful quantum computers, namely quantum computers with about 20 million physical qubits, will be capable of breaking widely used encryption algorithms such as RSA and ECC, according to the German national cyber security agency BSI.

As consequence, once powerful quantum computers exist, currently used asymmetric encryption, for instance, PGP used for email encryption, will not be safe to use anymore. Even worse: powerful adversaries around the world already scoop up encrypted data shared via the internet with the aim of decrypting it once they have access to quantum computers.

For this reason, we need quantum-resistant cryptography now – not in five or fifteen years.

Tuta is leading the way in post-quantum encryption for email

Turn ON Privacy in one click.

1 month free!

Fortunately, no quantum computers are needed for post-quantum encryption. At Tuta, we started to update to quantum-safe algorithms in 2020, and in March 2024, we released the first hybrid protocol that is able to encrypt emails in a quantum-resistant manner.

At Tuta, we’ve always put privacy and security first. That’s why, in response to the growing threat of quantum computing, we invested into post-quantum cryptography early on to become the first encrypted email service to offer quantum-safe encryption to anyone. This means that encrypted emails of millions of Tuta users are now protected against both current and future quantum attacks.

Here’s what we’ve accomplished:

• Hybrid post-quantum cryptography: We’ve deployed a hybrid system combining x25519 (elliptic curve) with ML-KEM, a post-quantum algorithm selected by NIST.

• Open source publication: Our post-quantum implementation has been fully published as open source on GtiHub for third party review.

• Cross-platform protection: Post-quantum encryption is now available across all Tuta platforms, on the web browser, on Android, on iOS, and on our free desktop clients for Windows, Linux, and macOS.

• Proof of security: Now, the Bergische University Wuppertal is commencing a formal proof of security of the hybrid TutaCrypt protocol.

Ready for the future!

Quantum computing is no longer a distant dream. With billions being invested by governments and big tech companies, quantum computing is a rapidly approaching reality, and with it comes a pressing need for stronger, future-proof cryptography. At Tuta, we’re not waiting for that future to arrive. We’re ready for it today!

On this World Quantum Day, we celebrate both the incredible potential of quantum technologies and post-quantum cryptography to safeguard our data. If you’re using Tuta, you’re already ahead of the quantum revolution: your emails and calendars are safe, now and in the future!

And best of all: For World Quantum Day you can try Revolutionary or Legend for one month completely free!