Privacy-Preserving Technologies for Telemedicine: Enhancing Trust in Cross-Border Healthcare Delivery

Telemedicine became critical infrastructure in the post-pandemic period — enabling cross-border consultation, remote monitoring and mHealth services at a scale nobody had planned for. It also raised questions that the technology had not answered: how patient data stays secure, how privacy is preserved, and how any of it complies with data protection regimes that differ from one jurisdiction to the next.

This paper asks how privacy-preserving technologies (PPTs) — blockchain, homomorphic encryption and federated learning — can strengthen trust, ensure compliance and reduce risk on telemedicine platforms operating across diverse regulatory environments.

Method

A systematic scoping review of peer-reviewed literature published between 2015 and 2025, across PubMed, IEEE Xplore, Scopus and Web of Science, alongside a comparative analysis of the relevant policy regimes.

What each technology actually offers

Homomorphic encryption permits analytics without direct access to the underlying data — a genuine guarantee, but one that remains computationally intensive enough to constrain where it can be deployed.

Federated learning offers strong privacy guarantees for AI-driven telemedicine, since models travel to the data rather than the reverse. It requires robust infrastructure and real collaboration between the institutions holding the data.

Policy alignment remains inconsistent. The significant gaps are in data sovereignty and cross-border consent management — precisely the two areas that determine whether a cross-border consultation is lawful.

Conclusion

Privacy-preserving technologies are a critical pathway to building patient trust and strengthening data governance in telemedicine. But integrating them successfully depends on three things the technology cannot supply by itself: regulatory harmonisation, context-sensitive implementation, and investment in digital infrastructure — especially in low- and middle-income countries, where the gap between what the standards assume and what the infrastructure provides is widest.

Co-authored with Precious Onyedika Chijioke.