Quantum computing isn't just a crypto problem - it's a money problem
By: Paul Quickenden, Swyftx NZ Country Manager
For years we've thought about cybersecurity primarily as a technology challenge. Quantum computing suggests it may be something broader than that.
Aside from AI, Quantum computing is quickly becoming one of the most talked-about emerging technologies today. In simple terms, quantum computers are being designed to solve certain types of mathematical problems dramatically faster than even today's fastest computers. This matters (a lot) because much of our digital world relies on mathematics to stay secure.
Every online bank account, payment system, government portal, digital identity platform and cryptocurrency wallet relies on cryptography for encryption and digital signatures - the mathematical techniques that scramble information and make it unreadable to anyone who isn't authorised to access it. Today's computers would take an impractically long time to break existing cryptography but quantum computers are projected to change that equation from decades to mere days and possibly even faster.
The good news is that that threat isn't immediate and no quantum computer today is capable of breaking modern encryption at scale. The concern is real enough, however, that governments, technology companies and cybersecurity experts are already preparing for a transition to post-quantum cryptography. In practice, that means developing and testing new forms of encryption designed to withstand the capabilities of future quantum computers before they become a real-world threat.
For crypto, the theoretical risk is relatively easy to understand because blockchain networks rely on public-private key cryptography. When a sufficiently advanced quantum computer can derive a private key from a public key, it could transfer funds without permission. That's the headline risk and the reason quantum computing is increasingly appearing in conversations across the industry, however that’s not the most interesting part.
Quantum isn't a crypto problem - it's a money problem.
Most commentary about quantum computing to date has focused on digital assets and this is understandable given the visibility of the sector’s vulnerability - but it's also far too narrow. The same cryptographic foundations that secure cryptocurrency wallets also secure online banking, payment networks, government systems, digital identities and much of the internet itself. If quantum computing eventually forces a shift to new security standards for ‘us’, every major financial institution on the planet will face many of the same questions currently being discussed within crypto.
In that sense, crypto isn't uniquely vulnerable - it may simply be one of the first industries openly preparing for a challenge that will eventually affect the broader financial system and the conversations happening today inside blockchain communities should become the conversations happening inside banks, payment providers and governments tomorrow.
The real risk may be coordination, not security
Most people assume the challenge is just technological, i.e. quantum computers create a threat; developers build stronger encryption and ‘hey presto’, the problem is solved. History, however, suggests major transitions are very rarely that straightforward.
A post-quantum migration would require developers, exchanges, custodians, wallet providers, institutions and users to coordinate one of the largest security upgrades in digital history. Unsurprisingly, designing a solution of this scale could be a lot less complex than deploying it. But it has been done, just like when we seamlessly went from HTTP to HTTPS on the internet.
Crypto has survived market crashes, exchange collapses and regulatory pressure but what it hasn't faced is a sector-wide coordinated infrastructure transition. The real challenge appears to not be whether security can be upgraded but whether communities can organise those upgrades before uncertainty begins to undermine industry confidence. How will people react when they are told their hardware wallet is now insecure and they need to buy a new model?
This is a very different problem from cryptography.
What crypto is teaching us
Importantly, crypto is effectively running the visible playbook before everyone else. Ethereum developers are already exploring post-quantum security pathways and the Bitcoin community is beginning to rally around the problem and debate how future upgrades should be approached.
And it's not just the protocols, companies like Metasig are leading the way with Post Quantum wallet development. These conversations and innovations are valuable but won’t be confined to crypto. Banks will need to have them. Governments will need to have them because even the chip inside your passport will need to be upgraded. Payment providers will need to have them. In short, anyone responsible for securing digital value will eventually need to consider what a post-quantum future looks like and how they plan to navigate it.
Specifics will differ from industry to industry, but the underlying questions are remarkably similar: who is responsible for the upgrade, how quickly can it happen and how do you maintain trust while making changes to critical infrastructure? What’s more, how seamless can you make it for users?
More than just a technology challenge
For years we've thought about cybersecurity primarily as a technology challenge. Quantum computing suggests it may be something far broader than that. It is also a governance challenge, a coordination challenge and ultimately a trust challenge. The timeline remains uncertain and the threat is not imminent; but the conversation around whether the institutions that underpin modern money are ready for what comes next have started and the organisations that navigate a post-quantum future successfully will be the ones that start preparing early, coordinate effectively and maintain confidence throughout the transition.
