Zero-Trust Engineering in Critical Emergency Telemetry

Personal safety tracking applications present a significant design paradox: how do you collect, stream, and expose high-fidelity location, audio, and video logs during a life-threatening crisis, while ensuring that the vendor, malicious third parties, or corrupt entities cannot spy on the user during normal operations?

At **ABHAYASTRA**, we resolve this challenge by implementing a strictly auditable **Zero-Trust Emergency Telemetry** architecture.

1. Client-Side Cryptographic Locks The Android client app is built to run entirely in an idle, offline-first sandbox. Your coordinates, voice clippings, and camera feeds are constantly buffered in an encrypted SQLite database on the device itself. The decryption keys for these buffers are derived using: - **Argon2id** key derivation functions. - Local biometric validation checks. - Zero server-side persistence of master seeds.

Only when a user activates the physical SOS trigger is the specific session key shared with pre-authorized emergency contacts via a cryptographically signed handshake.

2. Ephemeral WebSocket Streams Once activated, telemetry streams do not pass through standard log-aggregating databases. Instead, coordinate updates and audio streams are broadcast through transient, in-memory **Redis Pub/Sub** channels to active WebSocket sessions of safety guardians. - **TTL (Time to Live)**: Active sessions automatically self-destruct 4 hours after a trigger is deactivated. - **End-to-End Encryption**: The payload is encrypted with the safety guardian's public key before routing through our servers.

3. Verification & Compliance Our open-source Kotlin client and Node servers undergo continuous independent audits. We believe that privacy during peace is just as critical as protection during crisis.