How does post-quantum cryptography work?

The post-quantum cryptography It has emerged as an innovation designed to tackle the challenges posed by future quantum computers, whose capabilities could jeopardise traditional encryption systems. These devices, which are still under development, promise to completely transform the way we process and protect information.

This technology, also known as post-quantum cryptography o post-quantum encryption, represents a significant leap forward in the protection of sensitive data. As fields such as artificial intelligence, the Internet of Things and robotics continue to develop, ensuring the security of communications and information is more important than ever. For this reason, post-quantum cryptography is emerging as a cornerstone of cybersecurity.

What is the aim of post-quantum cryptography?

The main aim of post-quantum cryptography is to develop encryption systems capable of withstanding attacks from quantum computers. Unlike traditional computers, these new devices have an exponential capacity to solve certain types of mathematical problems, such as the factorisation of large numbers or the calculation of discrete logarithms. These are precisely the foundations upon which current cryptographic algorithms are based.

Once quantum computers become a practical reality, they could break many of the security systems used today. The aim of post-quantum cryptography is to stay one step ahead of this scenario by proposing durable solutions to this new threat, before it becomes a real problem.

The aim is to create algorithms that do not rely on mathematical structures vulnerable to quantum computing, and which can be securely integrated into existing digital systems. The key lies not only in designing new encryption methods, but in doing so without sacrificing efficiency, speed or compatibility with current environments. This is one of the main challenges in their development: achieving quantum security without systems losing performance.

How does cryptography benefit cyber security?

Cryptography is one of the fundamental tools of cybersecurity. It enables the confidentiality of data to be protected, the integrity of information to be verified and users to be authenticated. With the advent of post-quantum cryptography, these benefits extend to a far more complex scenario: that of potential attacks arising from quantum computing.

Among the key benefits that post-quantum cryptography brings to cybersecurity, the following stand out: 

• Long-term protection: Many systems require information to be protected for decades. Without quantum-resistant cryptography, this data would be at risk in the future.
• Prevention of delayed attacks: An attacker could intercept encrypted data today and wait until quantum technology becomes available to decrypt it.
• Security in critical sectors: Sectors such as banking, healthcare, defence, the civil service, or even technological fields such as robot programming They need to be prepared for any developments that might compromise their communications.
• Upgrading technological infrastructure: Adopting post-quantum cryptography requires systems to be reviewed and strengthened, which also helps to address existing vulnerabilities.

All of this makes post-quantum encryption a strategic investment in the medium and long term for governments and businesses wishing to remain at the forefront of digital security.

Beyond encryption: strategic impact on organisations

Post-quantum cryptography offers more than just technical advantages. Its adoption has organisational and strategic implications for businesses and organisations. Committing to these solutions now enables:

• Improving corporate reputation, by demonstrating an active commitment to innovation and data protection.
• Complying with future international regulations, which will probably require standards that are resistant to quantum computing.
• Fostering a culture of technological foresight, which is crucial in an environment where cyber-attacks are evolving rapidly.

This proactive approach can make the difference between suffering a security crisis and leading the way towards resilient cybersecurity.

Why is post-quantum cryptography being added to the new version of Windows 11?

Microsoft has announced that the new version of Windows 11 will include support for post-quantum cryptography, marking a milestone in the widespread adoption of this technology. The operating system will integrate quantum-resistant algorithms by default, as part of its «quantum resilience» initiative.

There are several key reasons behind this change: 

• Protecting business and government communications: The integration of post-quantum security in Windows 11 enhances the protocol for connecting to VPNs and servers, incorporating algorithms approved by the NIST (US National Institute of Standards and Technology).
• Setting an industry standard: By incorporating this technology natively, Microsoft is helping to accelerate the transition to a new security paradigm, whilst encouraging the rest of the technology ecosystem to follow its lead.
• Preparing for the future: Although quantum computing has not yet reached commercial maturity, its development is progressing rapidly. Implementing protective measures now will help avoid unnecessary risks in the medium term.

This update has significant educational value. By incorporating post-quantum cryptography into a widely used operating system, it makes it easier for both developers and IT professionals to begin familiarising themselves with these new encryption methods. It could even be incorporated into training programmes in areas such as An Introduction to Cybersecurity, making this technology a cross-disciplinary field of knowledge.