Secure Telemetry & Internet Relay

The secure data-transfer part of a team telemetry project, designed, developed and tested independently during an engineering internship at the Cyprus Space Exploration Organisation. Other team members handled data collection and its use; this component moves the data safely between computers over the public Internet.

It consists of a sender, a relay, a receiver and a user interface. Delivery is authenticated and integrity-checked, every message is acknowledged, data waits in an offline queue when the link is down, and duplicates are rejected when it comes back. Everything is written to structured logs.

Category :Networking / Secure Systems
Stack :C++, Rust, Linux
Components :Sender, relay, receiver, user interface
Delivery :Authenticated, integrity-verified, acknowledged
Resilience :Offline buffering, duplicate rejection
Validation :Recovery tests across separate systems and networks
Status :Working prototype / source code not published

Secure telemetry network with a shield and padlock

Core Features

The design goal was a data path that keeps working when the network does not: nothing is lost on a dropped link and nothing is processed twice after it recovers.

Authenticated delivery between sender, relay and receiver.
Integrity verification of every message.
Acknowledgement handling, so the sender knows what arrived.
Offline queues that hold data while the connection is down.
Duplicate detection and rejection after retransmission.
Structured logging for diagnosis.

“A telemetry link is only useful if it survives interruptions without losing or repeating data.”

Design Note - Reliability First

Architecture

The system is layered: a transport over the public Internet, a delivery protocol that adds authentication, integrity checks and acknowledgements, a queue-and-recovery layer that buffers and de-duplicates, and the user interface on top. The diagrams are conceptual and show the structure described in the project, not the source code, which is not published.