Digital security depends on a simple assumption. Certain mathematical problems take too long for computers to solve. This assumption protects financial transactions, private communication, identity systems and government data.
Quantum computing is about to break that barrier.
In a recent policy briefing, Kent Walker, President of Global Affairs at Alphabet Inc., and Hartmut Neven, founder of Google Quantum AI, warn that existing encryption methods may not remain reliable once large-scale quantum computers become practical. They call for coordinated global action to strengthen digital security before that point.
The recommendation focuses on post-quantum cryptography, new encryption methods designed to withstand future quantum attacks. The transition, they argue, must begin now because digital infrastructure takes years to redesign.
How Quantum Computing Challenges Existing Security
Most online security relies on public-key cryptography. It protects banking systems, confidential data, digital signatures and secure communication. The technology works because conventional computers require enormous time and processing power to solve the mathematical problems behind the encryption.
Quantum computers follow a different model of computation. They process multiple possibilities at once and can solve certain mathematical problems far more efficiently. Some of these problems form the basis of widely used encryption systems such as RSA and elliptic curve cryptography.
If quantum machines reach sufficient scale, these protections may become vulnerable.
The concern also involves long-term data exposure. Security specialists describe a growing practice known as “harvest now, decrypt later”. Attackers collect encrypted information today and store it until future computing power allows decryption. Data with long-term value, including state records, intellectual property and personal information, becomes a target.
Research progress over the past decade has reduced the estimated resources required to break current encryption. Each improvement changes risk calculations for governments and enterprises.
Post-Quantum Cryptography Explained
Post-quantum cryptography (PQC) refers to encryption techniques designed to remain secure even in the presence of powerful quantum computers. These solutions are primarily software-based and can be deployed through system upgrades.
PQC algorithms rely on mathematical problems that remain difficult for both classical and quantum machines. Many approaches use lattice-based cryptography, which involves complex high-dimensional structures that resist efficient solution.
The goal is continuity of security. Information protected today should remain secure in the future.
To support global adoption, the National Institute of Standards and Technology completed its first set of post-quantum cryptographic standards in 2024 after an international evaluation process. These standards provide technical guidance for migration across public and private sectors.
Implementation, however, is not straightforward. Cryptographic systems are embedded in operating systems, applications, communication protocols and hardware devices. Updating them requires careful coordination.
Google’s Preparation for the Post-Quantum Era
Google reports that its work on quantum-resistant security began in 2016. The company has tested new cryptographic approaches, deployed early protections within internal infrastructure and introduced experimental implementations in user-facing products.
One guiding idea behind this work is crypto agility. Systems should allow security algorithms to be replaced or upgraded without disrupting services. This flexibility reduces long-term risk as technology and threats develop.
Google describes three main areas of focus:
Ongoing research and threat analysis
The company studies how advances in quantum hardware affect the strength of current encryption. The findings help estimate future risk and guide transition planning.
Deployment of quantum-resistant protections
Early implementation within networks and services helps evaluate performance, compatibility and operational impact.
Strengthening shared infrastructure
Global digital security depends on common systems such as certificate authorities and network protocols. Weakness in these components can affect entire ecosystems. The company therefore emphasises protection at foundational levels.
Google views these measures as necessary to maintain trust in digital systems that support economic activity and public services.
The Scale of the Migration Challenge
The shift to post-quantum security involves more than software updates. It requires structural changes across the digital ecosystem.
Cryptography supports software authentication, secure communication, electronic payments and identity verification. Replacing these mechanisms affects devices, networks and data systems worldwide.
Many systems in use today were not designed for cryptographic replacement. Some contain fixed security components that are difficult to modify. Organisations must also develop technical expertise to manage the transition safely.
Because digital systems are interconnected, partial adoption creates gaps. Security improves only when migration occurs at scale.
Policy Priorities for Governments
The briefing stresses that technical progress alone cannot secure digital infrastructure. Public policy and institutional coordination remain essential. Several priorities are highlighted.
Protection of critical infrastructure
Security upgrades must extend to sectors such as energy, telecommunications and healthcare. These services rely on complex systems that require long preparation cycles.
Secure foundations for artificial intelligence
AI systems depend on trusted data and reliable computing environments. Quantum-resistant encryption must form part of their design.
Global consistency in standards
Different security approaches across regions create vulnerabilities. Shared standards support interoperability and stronger protection.
Cloud-led modernisation
Migration away from legacy systems becomes easier in cloud environments where security updates can be implemented centrally.
Continuous engagement with technical expertise
The timeline for large-scale quantum computing remains uncertain. Ongoing dialogue with researchers helps policymakers plan effectively.
Opportunity, Risk and the Future of Digital Trust
Quantum computing promises significant scientific benefits. Researchers expect advances in medicine, materials engineering and energy systems through more precise modelling of complex processes. Problems that currently demand extensive computing resources may become easier to solve.
The same capability introduces new security pressures. Modern digital trust rests on mathematical assumptions that quantum systems challenge. Once those assumptions weaken, the protection of sensitive information becomes uncertain.
The impact would affect financial networks, public services, industrial systems and personal data protection. Information encrypted today may remain sensitive for decades. If it is captured now and decrypted later, the consequences cannot be reversed.
For this reason, the transition to post-quantum cryptography represents a long-term infrastructure effort. Security mechanisms across global networks must be redesigned while services continue to operate. The process requires coordination between governments, industry and research institutions.
The position outlined by Google reflects a long-range view of technological change. Preparation must take place before existing safeguards lose reliability. The pace of this transition will influence the stability of digital systems for decades.
Quantum computing will expand scientific capability. It will also reshape the foundations of cybersecurity. The outcome depends on how effectively institutions prepare for both realities.
