A century after quantum mechanics deeply reshaped our understanding of the physical world, its impact on digital security is now emerging with increasing clarity.
Quantum computing is driving a structural shift in cryptography, that mathematical framework that protects digital data, authenticates identities, and secures both online communications and national infrastructures.
This is an unprecedented change in the modern history of computing, whose consequences will shape how we conceive and guarantee security for decades to come.
In 2025, proclaimed by the United Nations as the International Year of Quantum Science and Technology, global attention to quantum innovation has significantly intensified.
This momentum has confirmed a strategic reality that remains more urgent than ever in 2026: cryptographic systems must begin their transition now if they want to remain secure in the quantum era.
The question facing security architects is no longer whether quantum computers capable of breaking cryptographic mechanisms will come into being, but when they will appear and whether current systems will have been adapted in time.
This shift from a possibility-based logic to a preparation-based logic must guide technological roadmaps, procurement strategies, and public decision-making.
If 2025 was the year of scientific momentum, 2026 must be the year of decisive action.
Recent advances in quantum computing reinforce this conclusion. Experimental platforms have demonstrated greater qubit coherence, more reliable logical operations, and the emergence of the first logical qubits protected by error-correction mechanisms.
These advances constitute concrete steps toward fault-tolerant quantum computing: systems capable of performing complex operations with enough reliability to threaten the most widely used encryption schemes.
Even though large-scale quantum computers remain years away, the trajectory is clear: we are moving from a theoretical concern to an operational urgency.
From a cryptographic standpoint, the impact is not uniform. Quantum computing poses a major threat to public-key cryptography, which relies on using a pair of keys (one public, the other private) to secure data and establish trust online.
These systems rest on mathematical problems deemed hard to solve, such as integer factorization or discrete logarithms. Algorithms like RSA or elliptic-curve cryptography, used in online banking services, encrypted emails, software updates, or cryptocurrencies, rely on these foundations.
Yet quantum algorithms, notably Shor’s algorithm, can solve these problems exponentially faster, making it possible to decrypt data that is currently protected.
Public-key cryptography is therefore fundamentally vulnerable in the quantum era. Symmetric encryption mechanisms, which rely on a single secret key to protect files or communications, are more resistant.
Quantum computers give them only a limited advantage, though they will require adjustments, notably larger key sizes, to maintain a high level of security.
This asymmetry creates a complex challenge at the system level. The cryptographic migration is not a one-off event but a long, distributed process, embedded in protocols, devices, firmware, software dependencies, and vast volumes of long-lived data.
Some systems can be updated with simple patches. Others will need to be gradually abandoned or replaced. Meanwhile, systems requiring long-term confidentiality are already exposed to the so-called “harvest now, decrypt later” strategy, which involves storing encrypted data now to decrypt it when quantum capabilities are sufficient.
The countdown has already begun, including for data produced today.
Despite these risks, the level of preparedness remains highly uneven. Many organizations lack complete cryptographic inventories, underestimate the complexity of replacing algorithms, or still view post-quantum cryptography as a distant issue.
This gap between awareness and actual deployment is, in itself, a growing vulnerability.
Bridging this gap requires more than awareness. It demands coordinated action around three interdependent priorities: cryptographic agility, real-world performance, and regulatory coherence.
Cryptographic agility — the ability to upgrade encryption mechanisms without rebuilding entire systems — must become a baseline requirement. Post-quantum algorithms must be embedded into protocols, key management systems, and hardware security modules in a way that enables future evolutions without major rewrites.
Visibility is the first indispensable step. Cryptography is often embedded throughout systems, but rarely visible. At scale, manual inventories become impractical. Automated tools capable of identifying and mapping cryptographic usage are no longer a luxury but a necessity.
Furthermore, post-quantum algorithms typically require larger keys, signatures, and ciphertexts, with potential implications for bandwidth, memory, or device performance. Security must therefore be evaluated under real-world operating conditions, not merely in theory.
Finally, public policy must evolve at the same pace as technology. Export controls, procurement rules, and conformity standards directly influence the speed of adoption. Incoherent directions raise systemic risk and foster fragmented responses that reveal new vulnerabilities.
Some countries have already embarked on this transformation strategically.
The United Arab Emirates is among them, recognizing that quantum-resistant cryptography is not an investment for tomorrow but an immediate necessity. This anticipatory approach—strengthening digital resilience before threats fully materialize—is precisely the stance the international community should adopt.
The NIST has laid the necessary foundations by validating several post-quantum algorithms based on lattice-based approaches, error-correcting codes, or hash-based functions, capable of withstanding quantum attacks.
But standardization alone is not enough. Fragmented or incoherent adoption creates interoperability problems and opens new attack surfaces. Consistency and coordination are as important as the algorithms themselves.
This transition is not merely technological. It is a test of our collective ability (governments, businesses, and international organizations) to act with the urgency the situation demands.
The mathematics are established. The standards exist. What separates today’s vulnerability from tomorrow’s resilience is execution: a disciplined, coordinated, worldwide implementation.
Every day of delay is another day of exposure.
The harvest has already begun.
It is time to decide what digital future we want to build and to start building it now.
*Dr. Mohamed Al Kuwaiti is the United Arab Emirates’ Chief of Cybersecurity and Dr. Najwa Aaraj is the CEO of the Technology Innovation Institute
