Hybrid post-quantum TLS for a public-sector data exchange
How a government agency could protect long-lived citizen data in transit with hybrid classical + post-quantum key exchange.
The situation
A government agency exchanges sensitive citizen records with partner agencies over the internet. The data must stay confidential for decades, making it a prime “harvest now, decrypt later” target. The agency wants to reduce that risk without breaking compatibility with partners.
Our approach
Select the scope
Pick the highest-value data flows — long-lived records crossing public networks — for the first pilot.
Compatibility testing
Test hybrid key exchange (classical + ML-KEM) across the agency’s and partners’ TLS stacks, load balancers and proxies.
Pilot deployment
Enable hybrid key exchange on selected endpoints with automatic fallback for partners not yet ready.
Performance & monitoring
Measure handshake latency, message sizes and error rates; monitor negotiated algorithms.
Scale-out plan
Extend to more services and partners, and plan post-quantum certificates once ecosystem support matures.
Typical technology
What success looks like
Metrics we would agree with you up front and track throughout:
- Share of sensitive traffic using hybrid key exchange
- Handshake latency overhead
- Connection failure rate
- Partners supporting hybrid TLS
- Time to enable on a new endpoint
This is an illustrative scenario showing how Inspired Infotech approaches this type of problem. It does not describe a specific client, and actual approach and outcomes depend on each organisation’s systems, data and goals.
Services behind this scenario
Quantum Computing
Quantum readiness, cloud quantum experiments and post-quantum cryptography (PQC) migration.
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