Zero-Trust Architecture for Robotics Fleets

Why Perimeter Security Fails

Traditional IT security assumes a trusted internal network. Once you're "inside," you're trusted. This model completely breaks down for robotics:

• Robots operate in physical spaces, not behind firewalls
• They communicate over WiFi, cellular, and mesh networks
• They're physically accessible to anyone in the environment
• A single compromised robot can attack the entire fleet

Zero-Trust Principles for Robots

Sentinel implements zero-trust at every layer:

1. Never Trust, Always Verify

Every request from a robot must include:

• Valid DID authentication
• Current trust token (not expired)
• Signed payload (Ed25519 signature)

2. Least Privilege

Robots only have permissions for their assigned tasks:

• A warehouse picker can't access shipping bay controls
• A patrol drone can't modify other drones' routes
• A forklift can't issue commands to other forklifts

3. Assume Breach

We design assuming any robot could be compromised at any time:

• All telemetry is independently verified
• Firmware integrity checked at every boot
• Anomaly detection runs continuously
• Trust scores degrade without positive signals

4. Micro-Segmentation

Fleet communication is segmented:

• Robot-to-robot communication requires mutual authentication
• Fleet commands are signed by the operator's key
• Cross-fleet access requires explicit authorization

Implementation

This isn't theoretical — Sentinel enforces these principles through:

• Hardware-backed identity (TPM/Secure Enclave)
• Cryptographic signatures on every message
• On-chain proof anchoring for immutability
• Dynamic trust scoring with automatic isolation