Mechanisms detect encryption failures by monitoring all traffic received for clear-text account data output by a misconfigured or faulty POI device, by detecting and reviewing cryptographic errors the HSM reports, and by detecting and reviewing unexpected transaction data such as messages without the expected MAC or signature, malformed messages, or devices causing unusually high authorisation rejection rates.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.