Why Post-Quantum Cryptography Matters: Preparing Today for Tomorrow’s Security Challenges

Date: 19-August-2026

Organisation: Hong Kong Computer Emergency Response Team Coordination Centre (HKCERT)

Writer: Hong Kong Computer Emergency Response Team Coordination Centre (HKCERT)

 

Quantum computing has made significant advances in recent years. Its immense computational power has quickly become a major topic of discussion and concern in the technology sector and is often regarded as a double-edged sword. On the one hand, there is interest in the opportunities and breakthroughs that quantum technology could bring to areas such as drug development and AI training. On the other hand, there are concerns that quantum computers could easily break today’s data encryption technologies by calculating the cryptographic keys involved in a much shorter time. This could pose significant risks and potential impacts, particularly for sectors that rely heavily on encryption, such as the financial industry and cryptocurrencies.

In any case, quantum technology will one day transform the way today’s digital landscape and cybersecurity operate. However, for most organisations, the practical question is not whether a large-scale quantum computer will emerge tomorrow. The more important question is whether today’s systems are adequately prepared for the long-term transition in cryptography.

Post-Quantum Cryptography (PQC) refers to cryptographic algorithms designed to resist against known classical and quantum attacks, including attacks from future cryptographically relevant quantum computers. Around the world, standards bodies and cybersecurity authorities are encouraging organisations to prepare by understanding where cryptography is used, identifying systems that rely on quantum-vulnerable public-key algorithms, and planning for future upgrades.

At the same time, industry bodies, telecommunications operators, research institutions and cybersecurity vendors are exploring how quantum-resistant cryptography may be implemented in real-world environments. These developments show that PQC readiness is not only a theoretical topic. It is becoming a practical issue for product design, procurement, system architecture, interoperability and long-term cyber resilience.

For organisations in Hong Kong, the immediate, large-scale replacement of existing encryption technologies is not realistic, as they are deeply embedded in various systems, often without users even being aware of their presence. The practical priority is risk-based migration planning, inventory, vendor engagement, and adopting PQC where standards and vendor support are ready. Organisations should begin by building visibility over their cryptographic dependencies, understanding which systems may be affected by future quantum risks, and ensuring that future technology investments can adapt as standards and industry practices continue to evolve.

For more details, please visit: https://www.hkcert.org/blog/why-post-quantum-cryptography-matters-preparing-today-for-tomorrow-s-security-challenges