Quantum computing could render existing encryption schemes obsolete, demanding an urgent rethinking of how digital security is built. Right now, encryption relies on mathematical problems, such as factoring large integers or computing discrete logarithms, that take classical computers an infeasible time to solve. Quantum algorithms, however, may solve these efficiently, says The Engineer.
One of the core risks comes from Shor’s algorithm, which, in theory, allows a quantum computer to factor large numbers quickly. That capability would break RSA and elliptic curve cryptography, which underpin much of today’s secure communications, digital signatures, and key exchanges. The article also points to the threat model “harvest now, decrypt later,” where adversaries can steal encrypted data now and wait until quantum machines are powerful enough to crack it.
The commentary stresses that waiting until quantum computers are mature is risky. Migration to post-quantum cryptographic (PQC) schemes should begin now to avoid a “security cliff,” especially for systems with long lifespans. Organizations need to invest in crypto agility, the ability to swap out cryptographic primitives, and carefully plan transitions, prioritizing high-value systems first.
Still, the author recognizes challenges: PQC algorithms are newer and less battle-tested; performance, implementation bugs, and interoperability issues are real concerns. Plus, transitioning a large ecosystem, i.e., device firmware, secure hardware, and network protocols, is complex and costly. But the cost of doing nothing, especially for sensitive data and infrastructure, is far greater.
The piece warns that quantum computing is not a distant hypothetical threat; it threatens the very foundations of digital trust. To survive, engineers, architects, and security leaders must act now, adopt quantum-resilient designs, and create systems ready for the shift from “hard math” to “harder proof.”