QuSecure demonstrates post-quantum TLS upgrade for Tier-1 telecom

QuSecure presented a case study at Mobile World Congress Barcelona showing how a Tier-1 telecommunications operator added post-quantum secure communications into existing network infrastructure without changing legacy application code.

The release described how the operator upgraded services to Transport Layer Security (TLS) 1.3 via a hybrid post-quantum key exchange and maintained operational continuity across existing systems, and how centralized cryptographic policy management provided visibility into cryptographic dependencies across the telecom network.

The deployment used a hybrid post-quantum key exchange combining X25519 with ML-KEM-768 and applied a gateway proxy layer-based cryptographic service mesh that performed TLS termination at proxies to upgrade encryption for services that used older TLS or plaintext, without requiring application code or infrastructure replacement.

QuSecure completed the initiative in collaboration with Accenture and executed a phased rollout across edge services, internal service-to-service connections, and hardened core transport links, introducing Post-Quantum Cryptography (PQC) incrementally while maintaining service availability and performance; the work was presented by QuSecure SVP of Global Strategy and Research Garfield Jones.

“This case study serves as a playbook for other telcos looking to operationalize post-quantum cryptographic readiness while building in control and agility for continued visibility,” said Jones. “This proves a realistic path for how quantum-resistant TLS can be introduced across existing networks, leaving existing applications unchanged.”

The case study was published on QuSecure’s website and was made available with the materials referenced in the announcement.