Quantum-safe cryptography for fintech: legal risk assessment guide for 2026

The development of quantum technologies is gradually turning cybersecurity from a technical issue into a legal risk for financial companies. Traditional encryption methods, which currently underpin data protection in fintech, may eventually be broken by quantum computers, creating a risk of future compromise of sensitive information. The “harvest now, decrypt later” scenario is particularly relevant, where data is collected today with the intention of decrypting it later. In this context, implementing quantum-safe cryptography is increasingly becoming not just a technological upgrade but a forward-looking compliance consideration. In this article, we examine key legal risks, regulatory expectations, and approaches to building a resilient data protection strategy.

What is quantum-safe cryptography and why does it matter for fintech

Quantum-safe (or post-quantum) cryptography refers to a set of cryptographic algorithms designed to protect data against potential threats from quantum computers. Unlike traditional encryption methods, these algorithms are resistant to attacks that may become feasible with advances in quantum computing.

Today, most financial systems rely on classical algorithms such as RSA and elliptic curve cryptography (ECC). While secure under current conditions, they could theoretically be broken using quantum algorithms like Shor’s algorithm.

This creates a long-term risk for fintech companies, particularly when handling sensitive data. Even if quantum computers are not yet widely used, data encrypted today may be compromised in the future.

A key risk scenario is “harvest now, decrypt later,” where attackers collect encrypted data now with the intention of decrypting it once more powerful technologies become available.

As a result, quantum-safe cryptography is no longer just a technical upgrade but part of legal risk management. Financial companies must consider potential vulnerabilities within their data protection and confidentiality obligations.

Key legal risks of quantum computing for fintech companies

The development of quantum technologies creates not only technical but also significant legal risks for fintech companies. The core issue is that current encryption standards may become insufficient to protect data, directly affecting information security obligations.

One key risk is the potential compromise of personal and financial data. If existing algorithms no longer provide adequate protection, this may be treated as a breach of data security requirements, leading to liability before regulators and clients.

Long-term data storage presents an additional concern. Companies handling sensitive information must consider that even encrypted data may be decrypted in the future, raising questions about compliance with data protection principles.

From a legal perspective, the main risks include:

1. Violations of data protection requirements (e.g., GDPR)
2. Liability for data breaches or compromise
3. Breach of contract due to failure to ensure security
4. Claims from clients and partners
5. Regulatory sanctions

There is also a risk that a company’s actions may be deemed insufficiently diligent if it fails to take reasonable steps to assess and mitigate emerging threats. As new standards and guidance develop, ignoring quantum risks may be viewed as a lack of due care.

Quantum-safe compliance: what regulators expect from fintech

Regulators do not yet require an immediate transition to post-quantum cryptography, but the direction is clear: companies are expected to assess quantum risks in advance and prepare for migration.

For fintech, this means quantum-safe solutions are becoming part of compliance, not just a technical strategy.

Shift from recommendation to expectation

Organizations such as NIST already recommend adopting post-quantum algorithms, while European regulators emphasize adapting security measures to emerging threats. NIST has already finalized post-quantum standards (FIPS 203/204/205, August 2024), and EU regulators are moving in the same direction - DORA’s ICT risk-management RTS expressly requires financial entities to address cryptographic threats, including those arising from quantum advances.

This sets a new standard: companies must not only protect data today but also consider future risks of compromise.

Crypto-agility as a core requirement

A key expectation is crypto-agility – the ability to replace cryptographic algorithms quickly without rebuilding systems.

Lack of such flexibility may be seen as insufficient protection, especially for sensitive or long-lived data.

Practical compliance expectations

Regulators expect fintech companies to take concrete steps:

• Inventory of cryptographic algorithms in use
• Identification of systems vulnerable to quantum attacks
• Assessment of long-term data exposure
• Development of a migration plan to new standards

The focus is not on immediate transition, but on having a clear strategy.

Vendor and infrastructure risks

Special attention is given to vendors and infrastructure. If core systems or external services do not support crypto-agility, this creates additional risks.

In such cases, liability may extend beyond the vendor to the company itself for failing to ensure adequate control.

When does failure to adopt quantum-safe encryption become a legal risk

Failure to adopt quantum-safe cryptography is not a violation in itself. However, at a certain point, a technical decision may become a legal risk, especially if a company ignores evident threats or regulatory guidance.

From technical delay to legal negligence

The key issue is the shift from an acceptable delay to negligence. If a company is aware of the risk but fails to take reasonable steps to assess and mitigate it, this may be considered a breach of due care standards.

With guidance from NIST, ENISA, and others, it is increasingly difficult to justify ignoring quantum risks as “not yet relevant”.

Data protection and long-term liability

Protection of long-lifecycle data is particularly important. If information is stored for years (e.g., financial or personal data), companies must consider the risk of future compromise.

Under GDPR, failure to address the “harvest now, decrypt later” scenario may be interpreted as insufficient technical safeguards.

Contractual and fiduciary obligations

Financial companies often assume contractual obligations to protect data. If information is compromised due to outdated cryptographic methods, this may lead to a breach of contract.

Fiduciary duty issues may also arise, especially where companies manage client funds or provide financial services.

Regulatory enforcement and future liability

At present, enforcement around quantum risks is limited, but the situation is evolving quickly. As standards and best practices develop, regulators may begin assessing company actions retrospectively.

This means decisions made today could be scrutinized in the future, particularly if it is shown that the company failed to take reasonable steps to adapt to emerging risks.

Key challenges in implementing quantum-safe cryptography

Despite growing pressure from regulators and standards, transitioning to quantum-safe cryptography remains a complex task for most fintech companies. The challenge lies not only in selecting new algorithms but in transforming the entire cryptographic infrastructure.

Technical and infrastructure limitations

One of the main difficulties is the incompatibility of new algorithms with existing systems. Many fintech platforms rely on legacy infrastructure not designed for rapid change.

Key issues include:

• Dependence on outdated cryptographic libraries
• Lack of support for post-quantum algorithms in current systems
• Difficult integration with external services
• Risk of failures when updating critical components

Cost and resource constraints

Implementing quantum-safe solutions requires significant investment, which can be a barrier for many companies.

Main cost factors:

• Upgrading IT infrastructure
• Implementing new cryptographic standards
• Training technical and compliance teams
• Hiring external experts

At the same time, the ROI of such investments is hard to assess in the short term.

Lack of standardization and maturity

Despite efforts by NIST and others, the post-quantum market is still evolving.

Companies face:

• Lack of fully established standards
• Risk of selecting the wrong algorithms
• Limited interoperability between solutions
• Uncertainty around large-scale adoption timelines

Business and operational risks

Even with technical readiness, the transition may affect business processes and user experience.

Key risks include:

• Reduced system performance
• More complex user workflows
• Need to adjust product logic
• Dependence on technology providers

How to build a quantum-safe strategy for fintech

Transitioning to quantum-safe cryptography requires a structured approach. It is not a one-time upgrade but a phased transformation affecting technology, processes, and compliance. Companies that start early gain flexibility and reduce legal risks.

Risk assessment and audit

The first step is assessing the current cryptographic infrastructure. Companies must understand which algorithms are in use and where key risks lie.

In practice, this includes:

• Inventory of all cryptographic solutions
• Identification of systems using RSA and ECC
• Analysis of long-term data storage
• Assessment of potential compromise scenarios

Migration planning

After assessing risks, a transition plan should be developed. Replacing cryptography affects multiple systems and cannot be done at once.

Key elements include:

• Gradual replacement of vulnerable algorithms
• Prioritization of critical systems
• Testing new solutions before deployment
• Minimizing operational disruption

Vendor and infrastructure review

Much of fintech infrastructure depends on external providers, making their readiness critical.

Companies should:

• Verify support for post-quantum solutions among providers
• Assess third-party dependency risks
• Include crypto-agility requirements in contracts
• Ensure system compatibility

Documentation and compliance

Legal protection largely depends on having a documented strategy. Even if migration is ongoing, companies must demonstrate active risk management.

This includes:

• Documented risk assessments
• An approved migration strategy
• Updated internal security policies
• Integration of quantum risks into compliance procedures

Ultimately, an effective quantum-safe strategy combines technical readiness with legal justification. Companies that can demonstrate proactive risk management are in a much stronger position from a regulatory standpoint.

How Key2Law helps fintech companies prepare for quantum risks

Transitioning to quantum-safe cryptography is not only a technical process but also a complex legal task involving data protection, regulatory compliance, and risk management. Without a structured approach, fintech companies risk non-compliance, potential liability, and scaling challenges.

Key2Law team helps fintech companies build a legally sound strategy for addressing quantum risks and integrating them into compliance frameworks. We support projects at every stage: from risk assessment to implementation and regulatory interaction.

Our experts provide comprehensive business support:

• Conducting legal and technical risk assessments
• Analyzing compliance with GDPR, NIS2, DORA and other standards
• Developing a transition strategy to quantum-safe cryptography
• Integrating crypto-agility into corporate infrastructure
• Updating internal policies and security procedures
• Preparing documentation for regulators and audits
• Assessing risks related to vendors and third-party services
• Supporting implementation and ongoing compliance

If your company handles sensitive data or plans long-term data storage, it is essential to address quantum risks early and build a robust protection strategy. Contact the Key2Law team to get expert support and ensure your business remains resilient in the face of emerging technological challenges.