By means of enhanced physical layer monitoring, Sital Technology’s Safe and Secure (SnS) technology provides continuous real time authentication, along with capability to detect and locate intermittent and continuous open or short circuit faults in 1553 buses.

In approximately the first four seconds following power-up, Sital’s SnS sensor performs a learning” process by monitoring all message transmissions. Out of this, the sensor and API software compute the “fingerprint” or “signature” parameter values for all nodes on the data bus. Following the learning period, the sensor monitors all received messages and looks for instances where message’s fingerprints don’t match the expected fingerprint.

These fingerprint mismatches indicate either a cyber “spoofing” (or impersonation) authentication violation, or an electrical (wiring) fault condition. The latter includes intermittent or continuous open or short circuits in a bus or stub cable, connectors, couplers, bus terminations or connected LRUs. Further, the SnS sensor is able to determine the specific type of open or short circuit, along with its approximate location.

Following detection of either a cyber authentication violation or an electrical fault condition, the SnS API will immediately inform the application software about the detected condition. In either case, it is then up to the system’s “security playbook” software to take the appropriate system-level action. This can include rejecting data from received messages where an authentication violation has been detected.