About the Project and Privacy Model
How the service is built, what principles we follow, and which threats we prioritize.
Updated: 2026-05-041. Mission
- SUN Messenger is designed as a privacy-first messenger focused on secure defaults and minimal server trust.
2. Privacy model
- Message content access is limited to end-user devices.
- The server stores only data required for identity, routing, and operational stability.
- Sensitive actions are protected with additional authentication and rate controls.
3. Threat boundaries
- Primary focus: protection against session compromise and unauthorized account access.
- Special focus: API defense against brute-force, spam, and abuse automation.
4. Whitepaper (public short form)
- Cryptographic model: E2EE for private messages.
- Operational model: minimal required data and bounded metadata retention.
- Governance model: security incident logging, response workflows, and regular updates.