Doctolib Siilo is a secure, asynchronous communication platform tailored for healthcare professionals. The 2025 Security Whitepaper outlines Siilo’s cryptographic architecture, including end-to-end encryption using NaCl libraries, secure key generation and storage, TLS 1.2 with certificate pinning, and device-level protections on iOS and Android. It details symmetric and asymmetric key management, secure message protocols, and a layered threat model addressing physical, network, and insider risks. Siilo balances robust security with usability, ensuring confidentiality of sensitive data while supporting clinical collaboration.

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