According to the Global Risk Institute, a single-day quantum attack disrupting one of the top five banks, U.S. Bank’s access to the Fedwire funds services could lead to an indirect GDP-at-risk impact of $2 to $3.3 trillion, which is roughly 10% to 17% of the United States of America’s GDP.
Considering the financial risk that looms over businesses due to cyber threats, treating it as a simple technology problem can lead to serious consequences. Business owners who continue to think that cyber threats can be dealt with by the IT team, firewall, endpoint protection, and annual audits are setting themselves up for trouble.
Among many technological advancements, quantum computing is a candidate that could render traditional cyber defenses irrelevant without ‘breaking a sweat’. But the question now is: How is that even possible?
The answer lies in the fact that the encryption (the cryptographic system that protects your business data) your company is using was designed in a world where quantum computers didn’t exist. That world is now ending.
It means the calculation is now simple and unforgiving. If Q-day arrives in 2030 and your organization is planning it in 2027, then you are already behind. So, understanding what the threat is, why the underlying quantum algorithms make it real, and what a credible business response looks like is no longer optional for senior leadership. It is a strategic imperative.
What Quantum Computing Actually Means for Your Encryption
To understand the threats that modern quantum computing algorithms possess, you dont need a degree in physics. What you need instead is an understanding of how quantum computers are categorically different from the systems running modern data centers in 2026.
Traditional computers process information in bits, where each bit is either 0 or 1. It means that, in the legacy system, every calculation happens in sequence, one at a time. This is why breaking modern encryption is computationally impossible on current computers. The number of possible keys is almost infinite, and working through them one by one would take may be billions of years.
On the other hand, quantum computers use qubits. Using the theories of superposition and entanglement, a qubit can represent 0 and 1 simultaneously, allowing quantum systems to evaluate enormous numbers of possibilities concurrently. As a result, for certain kinds of mathematical problems, the ones that underpin modern encryption, this represents an exponential leap in computational capabilities.
That’s why Gartner now predicts that quantum computers will be capable enough to break all public keys by 2029.
Two Quantum Algorithms That Every Business Leader Should Know
The basis of quantum computing lies in two quantum algorithms: Shor’s and Grover’s algorithms. Therefore, as a business leader, you need to be aware of these two to better gauge the possibilities that they offer.
Shor’s Algorithm
Named after the mathematician Peter Shor, this algorithm can factor in large prime numbers exponentially faster than any classical computer. This capability proves important because RSA encryption, elliptic-curve cryptography (ECC), and Diffie-Hellman key exchange, the cryptographic foundations of HTTPS, VPNs, digital signature and secure financial transactions, all derive their security logic from the assumption that factoring large prime numbers is computationally impossible at this moment. But Shor’s Algorithm dismantles that assumption.
Therefore, the obvious question now is: what are the business implications? Well, a quantum computer running Shor’s algorithm can easily decrypt a company’s secure communication channel, invalidate digital signatures, and undermine the integrity of financial transactions. It means that every asymmetric encryption protocol that your organization relies on today is potentially vulnerable.
Grover’s Algorithm
Named after Lov Grover, this quantum algorithm works differently. Instead of breaking the asymmetric encryption, it accelerates the ‘brute-force’ search for unstructured data. As a result, the security of the symmetric-key encryption decreases.
For instance, the AES-128, used for encrypting data at rest, becomes as vulnerable as AES-64 under Gorver’s Algorithm. The AES-256, however, maintains its integrity, prompting the organizations to upgrade their systems.
Therefore, when these two algorithms are used together, it can lead to a systematic dismantling of the cryptographic stack that underpins virtually all modern digital security.
The Threat That is Already Happening: Harvest Now, Decrypt Later
One thing about quantum risk that business owners must render their attention to is that it is not waiting till the Q-day; it is here now. This leads to the obvious query: how are all these happening?
Well, currently, sophisticated cybercriminals are working on a strategy that security experts call ‘Harvest Now, Decrypt Later’ (HNDL). The tactic is precisely what the name suggests: intercept and store the encrypted data today, and keep it long enough for quantum computing to mature before it can be decrypted.
Therefore, for data with a higher ‘shelf-life,’ this is not a future problem; it is a present one. For instance, a competitor harvesting the M&A data of your business today can decrypt it eight years later, which is long before it becomes strategically invalid.
This makes industries like financial services, healthcare, defense supply chains, telecommunications, and government organizations highly vulnerable. So, if your organization operates in any of these sectors, your quantum risk assessment should start now, not when the hardware matures.
The Strategic Business Response: From Inventory to Action
Knowledge of how quantum algorithms work or the risks they pose is valuable, but translating that knowledge into business action is important and requires a structured approach. So, here is a practical starting point for you, as a business leader:
Start With A Cryptographic Inventory
The first step is identifying every system, application, data store, and communication channel in your business unit that relies on the old, vulnerable systems. After that, prioritize modernization based on data sensitivity and data longevity.
Build Crypto-Agility
Crypto-agility means designing the systems and infrastructure to swap cryptographic algorithms without replacing the whole underlying architecture. So, companies that now invest in crypto-agility will execute quantum migration far more efficiently at a much lower cost.
Prioritize Post-Quantum Cryptography (PQC) As Migration Path
PQC uses mathematically complex algorithms such as lattice-based cryptography, hash-based signature, and related approaches that are believed to thwart both classical and quantum breaches.
In 2024, NIST (National Institute of Standards and Technology) finalized its first PQC standard (NIST Post-Quantum Cryptography Standards), including ML-KEM and ML-DSA algorithms. The result, they must become your automatic migration targets.
A good thing about PQC is that it is software-based and integrates seamlessly with the current network infrastructure. Therefore, unlike Quantum Key Distribution (QKD), which requires dedicated hardware, it is a cost-effective solution for most businesses outside the Government and Defense sector.
Elevate Quantum Risk On The Enterprise Risk Register
The last subject on this list is probably the most overlooked as well. Businesses, in 2026, need to push up quantum risk on the list of possible threats that can disrupt business operations. Irrespective of the department, starting from the CEO to the CFO, COO, and so on, everyone must understand the implications of quantum risk and implement the required measures accordingly to avoid any undue disruptions to the company’s interests.
The Window for Strategic Action is Now
The quantum algorithms that can break today’s encryption exist in 2026, and they are mathematically proven. But what stops them from doing so is the lack of hardware maturity. However, that timeline is also compressing faster than most enterprise planning cycles account for.
Therefore, business leaders who are treating quantum security as a future concern are making a decision by default. They are choosing reactive, expensive, compressed migration over deliberate, structured, cost-effective transition.
However, the ideal move for business leaders should be to act now on their terms, not later on others’.
