Quantum computers are no longer a distant prospect. The computational power of quantum technology is advancing at a pace that makes classical encryption increasingly vulnerable. Organizations that wait to act now risk having sensitive data encrypted today become readable tomorrow for attackers applying a “harvest now, decrypt later” strategy. In 2026, quantum security is no longer an optional topic. It is a concrete priority for every organization that takes its network infrastructure seriously.

How close is the quantum threat to networks?

The threat is closer than many IT teams realize. Although a fully operational, cryptographically relevant quantum computer is not yet widely available, development is moving fast. Governments, research institutions, and attackers are investing heavily in quantum technology. The real risk lies not only in the future but in the present: encrypted network traffic intercepted today can be decrypted later once the computational power becomes available.

Networks are a particularly vulnerable target. Data streams over fiber optics, management traffic, authentication protocols, and VPN tunnels all depend on encryption standards that quantum computers can break. Organizations that begin transitioning to a quantum-safe network now will have an advantage that will be difficult to recover later. The nine measures below provide a concrete starting point.

1: Map all encrypted data streams comprehensively

Before you can secure anything, you need to know what needs to be secured. Many organizations lack a complete picture of which data streams are encrypted, which encryption standards are in use, and how long that data remains sensitive.

Start with a cryptography inventory: map all connections, protocols, and key lengths. Consider WAN connections, internal segmentation, management traffic, and API communications. Identify which systems use RSA, ECC, or other vulnerable algorithms.

This inventory forms the foundation for all subsequent steps. Without this overview, a structured migration to post-quantum cryptography is virtually impossible. It is also the moment to determine which data deserves the highest priority based on sensitivity and retention period.

2: Migrate to post-quantum cryptography standards

Post-quantum cryptography (PQC) encompasses algorithms that are resistant to attacks from quantum computers. In 2024, the American NIST published the first official PQC standards, including CRYSTALS-Kyber for key exchange and CRYSTALS-Dilithium for digital signatures.

Migrating to these standards requires a structured approach. Not all systems and vendors fully support PQC yet, making a hybrid transition period necessary. Hybrid encryption combines classical and post-quantum algorithms, ensuring communications remain protected even if one of the two methods fails.

Prioritize systems that process or store sensitive data over the long term. Financial data, patient records, and critical infrastructure communications require the fastest migration. Take into account the lifecycle of hardware and software to ensure investments are sustainable.

3: Implement layer 1 and layer 2 encryption on the network

Encryption at higher OSI layers such as TLS at layer 7 is widely deployed but does not provide complete protection. Attackers who gain access to the physical infrastructure or the data link level can intercept traffic before higher-layer encryption becomes active.

Layer 1 and layer 2 encryption provides protection at the deepest level of the network. Layer 1 encryption secures the raw signal on the physical connection; layer 2 encryption operates at the Ethernet frame level. Both methods are transparent to higher-layer protocols and add minimal latency.

This is especially relevant for organizations with high confidentiality requirements, such as data centers, hospitals, and critical infrastructure. Encryption at layers 1 and 2 ensures that data is protected regardless of what happens at higher levels. It forms a solid foundation for a quantum-safe security strategy. To explore the optical networking products that support this level of encryption, it is worth reviewing the available hardware options.

4: Deploy quantum key distribution (QKD) strategically

Quantum key distribution uses the principles of quantum mechanics to exchange keys in a way that cannot be physically intercepted without detection. Any attempt at interception disturbs the quantum signal and becomes immediately apparent.

QKD is not practical or cost-effective for every connection. The technology requires specialized hardware and operates over limited distances via fiber optics or free-space optics. Deploying it strategically means prioritizing QKD for the most critical connections, such as links between data centers or connections used for classified government communications and financial clearing.

QKD complements PQC rather than replacing it. Combine both approaches for maximum protection on sensitive connections. Account for infrastructure requirements and plan the rollout in line with your organization’s broader quantum security roadmap.

5: Accelerate crypto-agility in network architecture

Crypto-agility is a network’s ability to switch encryption algorithms quickly without major architectural changes. This is one of the most valuable capabilities in an era of rapidly evolving threats.

Build network solutions so that algorithms, key lengths, and protocols can be centrally managed and rapidly deployed. This requires modular software architecture, centralized key management, and network components that support multiple cryptographic standards.

Organizations that build in crypto-agility now will be better prepared for future changes in standards and newly discovered vulnerabilities. It prevents a weakness found in one algorithm from crippling the entire security infrastructure. Crypto-agility is therefore an investment in resilience, not just in current security.

6: Secure authentication protocols against quantum attacks

Authentication protocols are a critical target for quantum-based attacks. Algorithms such as RSA and ECDSA, which form the basis of many PKI infrastructures and digital certificates, are vulnerable to quantum computers running Shor’s algorithm.

Replace vulnerable authentication mechanisms with quantum-resistant alternatives. This applies to VPN authentication, certificate infrastructure, network access control, and management interfaces. Work with vendors to verify whether their solutions support PQC-compatible authentication or have it on their roadmap.

Multi-factor authentication strengthens security during the transition period but is not a substitute for migrating to quantum-resistant algorithms. Combine both approaches and establish a clear timeline for replacing vulnerable certificates and keys in your infrastructure.

7: Protect out-of-band management traffic

Out-of-band management (OoBM) allows administrators to manage network equipment through a separate, independent network. This is critical for secure administration, but the management traffic itself is also an attack vector that must be protected.

Ensure that out-of-band management connections are encrypted using quantum-resistant protocols. Restrict access to management interfaces through strict network segmentation and strong authentication. An attacker who gains access to the management network can compromise the entire network infrastructure, regardless of how well the production traffic is secured.

OoBM security is particularly relevant for organizations with distributed infrastructure, such as telecommunications companies, utilities, and transportation networks. Do not only secure production traffic. Treat the management plane as an equally critical target in your quantum security strategy. Managed security services can play a valuable role in maintaining continuous oversight of the management plane across distributed environments.

8: Train technical teams on quantum security risks

Technology alone is not enough. The people who design, manage, and secure networks must understand the risks that quantum computers pose and how to respond to them.

Invest in targeted training for network engineers, security architects, and IT managers. Topics to cover include how quantum algorithms work and their impact on classical encryption, the current state of PQC standards, and practical implementation skills for quantum-safe solutions.

Awareness at the management level is equally important. Decision-makers must understand the urgency and be willing to invest in the transition to quantum security. A well-trained team makes the difference between a proactive migration and a reactive crisis when the threat becomes acute.

9: Develop a quantum security roadmap with milestones

A quantum security roadmap translates the urgency of quantum security into a concrete, actionable plan. Without milestones and assigned responsibilities, the transition to a quantum-safe network remains an intention without progress.

Define clear phases: inventory and risk assessment, prioritization of critical systems, pilot implementations, broad rollout, and continuous evaluation. Tie each phase to a timeline, a budget, and an accountable owner. Account for the lifecycle of existing infrastructure and plan replacements to coincide with the PQC migration.

Review the roadmap regularly based on new developments in quantum technology and PQC standards. The threat evolves quickly, and a static plan loses its value fast. A living roadmap that is updated based on new insights provides the greatest assurance over the long term.

How we help with quantum security for your network

We understand that transitioning to a quantum-safe network is complex. Every organization has a different infrastructure, different risk profiles, and different timelines. That is why we do not work with off-the-shelf solutions, but with an approach tailored to your specific situation.

• Quantum security advisory and risk assessment: We map your current cryptographic vulnerabilities and translate them into a prioritized action list.
• Layer 1 and layer 2 encryption: We implement encryption at the deepest levels of your network infrastructure, ensuring data is protected before higher-layer protocols come into play.
• Post-quantum cryptography migration: We guide the transition to PQC standards, including hybrid implementations for the transition period.
• Out-of-band management security: We secure your management plane as a separate, critical component of your security strategy.
• End-to-end support: From design and implementation to management and evaluation, we remain involved throughout the full lifecycle of your security solution.

Want to know where your organization stands on quantum security and which steps should be taken first? Contact us for a no-obligation conversation with one of our specialists.