Seald

Seald is a data protection company, acquired by OVHcloud, that provides end-to-end encryption (E2EE) technology designed to be integrated into third-party applications and services. The company offers an SDK and related tooling that enables developers to embed E2EE directly into their products, ensuring that sensitive data remains encrypted at all times — including on the service provider's own servers — so that only intended recipients can decrypt and access it. Seald's core technology addresses a fundamental limitation of traditional server-side encryption models, where intermediary servers can technically access plaintext data. By implementing E2EE at the application layer, Seald ensures that even the application vendor, its hosting provider, or any party with server access cannot read user data. The company targets software developers and organizations in sectors that handle sensitive data, with documented use cases in healthcare (e.g., medical record sharing platforms, teleconsultation software) and enterprise applications. Their technology helps customers address compliance requirements under frameworks such as GDPR, ITAR, and NIS2, as well as mitigate risks associated with data breaches and government data access requests (e.g., the U.S. CLOUD Act). Seald also publishes technical educational content around encryption best practices, including common implementation mistakes such as using AES-CBC without HMAC-SHA256. The company's approach is centered on making E2EE accessible to developers without requiring deep cryptographic expertise, reducing the barrier to adopting strong data confidentiality measures in modern applications.