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Stronger, simpler encryption

Origin of symmetry

The natural evolution of encryption

Arqit confronts an existential threat to the hyperconnected world

The legacy encryption we all use was designed in the 1980s. It was never intended for use in our hyper-connected world. It has done a great job but it’s now failing us.

We see breaches caused by its flaws daily. But there is a bigger problem. Quantum computing poses an existential threat to everyone’s cyber security.

In response the world must begin a global upgrade to replace all encryption technologies. This is an upgrade unlike anything we have seen before.

Patching and mending, and taking risks with incremental improvements to public key encryption, which is no longer fit for purpose, is not the answer.

Symmetric keys are provably secure against any attack, including quantum computing. But until now, there was no safe and efficient way to distribute them. Arqit gives you a method to create those keys at scale, securely, at any kind of endpoint device. Arqit’s product, QuantumCloud™ is symmetric encryption, reborn for the cloud.

"Arqit has a simpler, more secure way for applications to use the internet. The layered approach that Arqit proposes is really awesome"

Taher Elgamal

'Founding Father' of SSL.

The problems

PKI & Certificate Management

Public Key Infrastructure (PKI) is a disconnected, offline technology

PKI is not always suited for a highly connected, centralised, online business network. In our hyperconnected world, businesses must manage a rapidly increasing number of endpoint devices beyond its firewall. This is intensifying the PKI management burden.

Manual Key Delivery

Many governments and enterprises do not trust PKI in their core networks

Organisations with the most stringent security needs still rely on people to transport the cryptographic keys that protect their networks around the globe. Aside from the increased cost and environmental impact, manual key delivery introduces more vulnerabilities and results in poor key refresh rates.

The quantum threat is coming...

The security implications of quantum computing for companies around the world are huge

Within this decade quantum computers are likely to break PKI. Core business systems and networks must move away from using PKI. We must do it once and do it right.

So-called post quantum algorithms (PQAs) are not mature enough to be relied upon and will introduce new complications, before being compromised themselves by either classical or quantum attack. No public key algorithm can ever be described as “Quantum Safe”.

Symmetric encryption keys, and the AES256 Symmetric Algorithm which uses them, are known to be secure against quantum attack. Arqit has developed a secure way to use them at scale.

Zero Trust

Protecting against current and future threats by removing the need for trusted third parties

Zero Trust is an architectural concept built around the idea that systems should not inherently trust any connection to a business system or application regardless of what trusted device or trusted network it originated from. Everything should be identity driven. This approach has led organisations to adopt PKI based technologies to help secure authenticated users and authenticate devices and systems. It ironically also brings in an entire federated trust model with it. This opens the organisation to a whole set of potential PKI vulnerabilities today, as well as the threat from quantum computers tomorrow. QuantumCloud™ can provide the encryption keys needed for a Zero Trust architecture without the larger attack surface and without the PKI trust model. It protects organisations against future threats from quantum computers.

Technical Thought Leadership


QuantumCloud™ is deep tech, but could not be easier to use

QuantumCloud™ puts a lightweight agent at any endpoint device. This software creates an unlimited number of symmetric keys with partner devices. The process is very simple and fast, and it is powered by quantum satellites in the cloud. These satellites use a revolutionary new quantum protocol which solves all the previously known problems of quantum key distribution.

That’s how we create a backbone of secure keys within data centres all over the world, and a quantum safe boundary protecting those data centres. The QuantumCloud™ end point software then creates new keys with a new cryptographic technique, unlike anything seen before.

QuantumCloud™ allows you to enrol your endpoint devices using a policy-based engine. This enforces security standards and determines your symmetric encryption refresh rate.

You can create an infinite number of symmetric key pairs, of any length up to one-time-pad, in groups as large as you need. Keys are never “delivered” so they cannot be intercepted. They are created trustlessly at the endpoints. Use them once and discard them.

Expertise you can trust

World class expertise across all domains

Our team of innovators is world class. Our physicists, mathematicians, cryptographers and engineers have collaborated to create cryptographic innovations in both the quantum and classical realms. With over 1,000 patent claims, our body of inventions is profoundly important and unlike anything developed before. You can depend on us.

How customers are using QuantumCloud™

Significant distribution partners secured in stealth mode


The incredible power and potential of next generation mobility is imperilled by the increased cyber attack surface. Arqit has solved this problem.

Fixed Line Networks

Unless the control plane of global networks is secure, no customer can trust it.

Industrial IoT

The power of automation will liberate us, but only if we trust the automated machines.

Financial Services

Our financial payments are already under attack, and quantum computers threaten all the digital assets in the world.

Smart City

The smart city of the future offers happier, easier living, but only if we can secure our identity and how it’s used.


The future of the battle space must be secured against well-funded state actors with quantum computers.