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Electronic signatures have become a cornerstone of digital trust, guaranteeing security, legal validity, and seamless digital transactions. But a technological revolution is on the horizon: quantum computing.
The arrival of quantum computers will bring immense opportunities for science and industry — but also an unprecedented threat to today’s cryptography. Experts call this moment Q-Day: the day when quantum machines will be powerful enough to break current encryption methods, undermining digital trust as we know it.
At XAYONE, we are among the first worldwide to implement post-quantum digital signatures, using ML-DSA (Modular Lattice Digital Signature Algorithm), one of the algorithms selected by NIST for standardization. Our solution ensures compatibility with existing standards like PDF, CMS, and PAdES, proving that organizations can secure their trust processes today while preparing for tomorrow.
Why Q-Day Threatens Digital Signatures
Quantum computing challenges the very foundations of digital security. Two well-known algorithms illustrate the threat:
- Shor’s algorithm can break RSA and elliptic curve cryptography, allowing attackers to recover private keys from public ones.
- Grover’s algorithm reduces the effective strength of symmetric encryption, making weaker keys like AES-128 unsafe.
For digital signatures, the consequences are severe:
- Compromised PKI authentication: eIDs, biometric passports, and certificates could be falsified.
- Forgery of signatures: contracts, medical files, or legal documents could be altered while still appearing authentic.
- Loss of legal validity: a signed PDF could lose its evidential weight if private keys are no longer secure.
- Insecure communications: VPNs, emails, and key exchanges could be exposed to quantum eavesdropping.
The question is not if but when. Organizations must prepare before Q-Day arrives.
The Business Impact of Quantum on Digital Trust
For organizations, the challenge extends beyond cryptography itself — it threatens the very foundations of compliance, operations, and reputation.
- Regulatory exposure: eIDAS 2.0, GDPR, and PSD2 all depend on secure cryptography. A quantum breach would mean non-compliance.
- Operational disruption: digital workflows and secure channels (PKI, VPN, email) could fail overnight, halting critical services.
- Financial and reputational damage: loss of trust from clients, partners, and regulators could lead to lawsuits, penalties, or market loss.
Quantum resilience has become a necessity. Organizations must act now to stay secure and compliant.
XAYONE Innovation : Post-Quantum Digital Signatures
At XAYONE, we have taken a decisive step forward. We are among the first worldwide to successfully implement and test post-quantum digital signatures using ML-DSA, one of the algorithms selected by NIST for standardization.
Our approach combines classical RSA with ML-DSA in a hybrid signature scheme and has been successfully tested on standard PDF workflows. This ensures interoperability with widely used systems and proves that organizations can adopt quantum-safe signatures without disrupting existing processes.
What sets this solution apart is the tangible value it creates for organizations:
- Seamless transition: By combining ML-DSA with RSA, organizations can maintain continuity with today’s systems while gaining quantum-resistant protection for the future.
- Immediate interoperability: The solution works with widely used standards such as PDF, CMS, and PAdES, meaning companies can secure their existing workflows without disruption.
- Future compliance: Built with evolving regulations in mind, including eIDAS 2.0 and ANSSI guidelines, to ensure long-term legal validity
From Threat to Opportunity
While quantum computing is a threat to existing systems, it is also a catalyst for innovation. By adopting hybrid approaches (combining classical and post-quantum cryptography), organizations can stay secure today while preparing for tomorrow.
At XAYONE, we follow closely the work of NIST and ANSSI to ensure our solutions remain interoperable and compliant. Our post-quantum roadmap is designed to give clients continuity, security, and long-term legal validity for their digital signatures and archives.
Prepare Your Organization Now
Quantum computing is inevitable. The question is whether your digital trust processes are ready.
At XAYONE, we are not waiting for Q-Day — we are preparing for it now. With our post-quantum digital signatures already tested and integrated, we help organizations stay compliant, secure, and future-proof.
Ready to prepare your organization for the post-quantum transition?
Schedule a Free Consultation or email us at sales@xayone.com.
