When to use
- Long outages on radio/Internet links.
- High-risk zones where no RF emission is wanted.
- Sync two distant islands (e.g., bus, NGO) by dropping a USB/SD.
Principles
- Export/import bundles with a clear manifest (scope, priority, TTL) + global hash.
- Media: USB key, microSD (S/H box, laptop, RPi).
- ACK on return to purge locally.
- Confidentiality: encrypted payload, minimal manifest.
Scenarios
- Town hall A exports to USB â bus â Town hall B imports, sends ACK back on the same USB.
- NGO carries keys between two isolated camps (P0/P1 messages).
- An S/H box with SD reader acts as a local âmailboxâ.
