The author continues their security research into Flume water monitor traffic decryption, having previously reverse-engineered the bridge firmware and identified LibHydrogen's Noise N key exchange implementation. They explored the possibility of passive decryption by implementing a full key exchange in a relay, but discovered that merely invalidating the stored key caused the server to reject the connection rather than reveal session key negotiation details.
Background
Flume is a smart water monitoring system that uses sensor bridges to communicate with cloud servers via encrypted MQTT. This follow-up research builds on previous work where the author analyzed the device's communication architecture and encryption mechanisms.
- Source
- Lobsters
- Published
- Aug 13, 2026 at 12:40 AM
- Score
- 6.0 / 10