Fuente: Wipo "IOT" Systems and methods for dynamic power efficiency based cryptographic protocol negotiation with Internet of Things (IoT) devices are disclosed herein. In an embodiment, a computer system (e.g., an identity management system) receives, from an IoT device, a device-side authentication initiation message containing a unique device identifier for the IoT device. The computer system uses the unique device identifier of the IoT device to identify a suitable cryptographic security protocol for the IoT device from the stored power efficiency reference table. The computer system sends a server-side authentication initiation message containing an indication of the identified protocol to the IoT device, and the computer system authenticates the IoT device according to the identified protocol.