Introduction

Quantum computing is moving faster than expected, and while fully fault-tolerant quantum machines are not here yet, their impact is already shaping cybersecurity decisions today.
For digital payment organizations, the biggest risk is simple: waiting too long to prepare.

Here are seven essential questions every CISO should be asking in 2025 to understand their exposure and their readiness for quantum threats.

1. Where does cryptography exist across our digital payment ecosystem?

Most organizations do not have a complete view of their certificates, encryption libraries, or key usage. Without visibility, preparing for quantum threats is impossible.

2. How dependent are we on RSA/ECC for our APIs, gateways, and authentication flows?

Shor’s algorithm will break RSA and ECC. Any system using these algorithms must be identified and tagged for priority migration.

3. Do we store long-term sensitive data that could be decrypted in the future?

Transaction archives, audit logs, backup files, token vaults anything retained for 7–10+ years is at risk of “harvest now, decrypt later.”

4. How well are our cryptographic keys managed and rotated today?

Weak or slow key rotation increases the window of exposure, even before quantum arrives. Quantum-safe security relies on improving key hygiene now.

5. Do our third-party partners and fintech integrations support strong and modern cryptography?

Vendors can become quantum-age weak points. Every integration should be reviewed for algorithm strength and certificate health.

6. Do we have a roadmap for transitioning to Post-Quantum Cryptography (PQC)?

Quantum-safe migration requires planning hybrid TLS, algorithm selection, HSM readiness, and long-term phasing. The roadmap must exist before regulators start asking for it.

Why These Questions Matter

Quantum readiness isn’t about predicting the exact year quantum computers will break RSA.
It’s about:

• Eliminating blind spots

• Making cryptographic systems agile

• Protecting long-retention payment data

• Avoiding urgent “rip-and-replace” future migrations

• Staying ahead of regulatory expectations

By answering these seven questions, CISOs gain clarity on their real exposure and the actions needed today to build a resilient payment ecosystem.

How SISA Can Help

SISA supports digital payment providers with:

• Cryptographic discovery

• Quantum risk identification

• Prioritization guidance

• PQC roadmap consulting

• Hybrid cryptography advisory

Whether your organization is just beginning to explore quantum risk or preparing to migrate, SISA provides the visibility and direction you need.

Conclusion

Quantum computing isn’t waiting and neither should digital payment organizations, these seven questions give CISOs a sharp, practical way to assess readiness and drive internal decision-making for a quantum-safe future.

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