QNS Services Succeeds in PoC for Quantum-Safe Communication Combining Toshiba's QKD System and Quantum Bridge's DSKE
QNS Services, in collaboration with Toshiba, successfully completed a Proof of Concept (PoC) for a highly available, redundant quantum-safe communication system. The hybrid setup uses Toshiba's QKD for the primary line and Quantum Bridge's DSKE for the secondary, ensuring uninterrupted secure VPN sessions even during line failures.
📋 Article Processing Timeline
- 📰 Published: April 3, 2026 at 19:00
- 🔍 Collected: April 3, 2026 at 10:30
- 🤖 AI Analyzed: April 21, 2026 at 06:19 (427h 49m after Collected)
QNS Services Inc. (hereinafter "QNS Services"), as a solution provider involved in quantum-resistant cryptographic communication, has collaborated with Toshiba Corporation (hereinafter "Toshiba") to successfully complete a Proof of Concept (PoC) for a redundant quantum-safe communication system that achieves both information-theoretic security and high availability.
In this demonstration, a two-site configuration simulating a connection between hub locations in a corporate network was built. A Toshiba QKD (Quantum Key Distribution) system was adopted for the primary line, while a key exchange method DSKE (Distributed Symmetric Key Establishment) running on a Quantum Bridge SDS (Symmetric-Key Distribution System) was adopted for the secondary line. The SDS is a symmetric key exchange infrastructure with crypto-agility that implements PQC and DSKE and can also interoperate with QKD.
The PoC assumed disaster recovery against a line disconnection during a disaster. These were applied to an IPsec VPN environment built with an enterprise router (SAE) and linked via the SKIP API to verify the coordination of key management. As a result, it was confirmed that even if a failure occurs in the primary line, it automatically switches to the secondary line, allowing ongoing IPsec VPN communication sessions to continue. Through this, it was demonstrated that even in a redundant configuration combining different quantum-resistant key distribution methods and different routes, continuous non-stop communication is possible while maintaining information-theoretic security.
With the advancement of quantum computing technology, companies and social infrastructure are requiring higher security and availability. Through this PoC, QNS Services confirmed the effectiveness of integration technology for incorporating quantum-safe communication technology into networks close to actual operational environments.
In this PoC, Toshiba provided technical cooperation regarding the QKD system, and the overall network design, as well as the evaluation and provision of other methods, were carried out based on the roles of each respective company.
■ Key Points of this Demonstration Test
1. Demonstration of switching redundant configurations of key exchange methods
By combining QKD on the primary line and DSKE on the secondary line, we demonstrated that encrypted communication can be consistently maintained during both failover and failback.
2. Confirmation of resilience through different methods and routes
By combining QKD, which uses dedicated lines, with DSKE, which can utilize internet lines, we demonstrated that secure communication can be maintained even in the event of a dedicated line failure.
3. Confirmation of failover during large-capacity data transfer...
In this demonstration, a two-site configuration simulating a connection between hub locations in a corporate network was built. A Toshiba QKD (Quantum Key Distribution) system was adopted for the primary line, while a key exchange method DSKE (Distributed Symmetric Key Establishment) running on a Quantum Bridge SDS (Symmetric-Key Distribution System) was adopted for the secondary line. The SDS is a symmetric key exchange infrastructure with crypto-agility that implements PQC and DSKE and can also interoperate with QKD.
The PoC assumed disaster recovery against a line disconnection during a disaster. These were applied to an IPsec VPN environment built with an enterprise router (SAE) and linked via the SKIP API to verify the coordination of key management. As a result, it was confirmed that even if a failure occurs in the primary line, it automatically switches to the secondary line, allowing ongoing IPsec VPN communication sessions to continue. Through this, it was demonstrated that even in a redundant configuration combining different quantum-resistant key distribution methods and different routes, continuous non-stop communication is possible while maintaining information-theoretic security.
With the advancement of quantum computing technology, companies and social infrastructure are requiring higher security and availability. Through this PoC, QNS Services confirmed the effectiveness of integration technology for incorporating quantum-safe communication technology into networks close to actual operational environments.
In this PoC, Toshiba provided technical cooperation regarding the QKD system, and the overall network design, as well as the evaluation and provision of other methods, were carried out based on the roles of each respective company.
■ Key Points of this Demonstration Test
1. Demonstration of switching redundant configurations of key exchange methods
By combining QKD on the primary line and DSKE on the secondary line, we demonstrated that encrypted communication can be consistently maintained during both failover and failback.
2. Confirmation of resilience through different methods and routes
By combining QKD, which uses dedicated lines, with DSKE, which can utilize internet lines, we demonstrated that secure communication can be maintained even in the event of a dedicated line failure.
3. Confirmation of failover during large-capacity data transfer...