Abstract: In some embodiments, an apparatus and method includes storing in a database at least one device record of an associated pair of parameters received from at least one client device during a provisioning of the at least one client device, with the associated pair of parameters including a build predefined identifier unique to the at least client device and a public key generated by the at least one client device. In response to an access-seeking client device seeking access to a private computer network, an authentication server receives a requested predefined identifier from the access-seeking client device and uses the requested predefined identifier to search the at least one device record in the database for a matched device record.

Abstract: A control system for estimating the performance of a compressor is disclosed. The control system has a compressor fluidly connected to an inlet manifold of a power source. The control system also has a power source speed sensor to provide an indication of a rotational speed of the power source, an inlet pressure sensor to provide an indication of a pressure of a fluid within the inlet manifold, an inlet temperature sensor to provide an indication of a temperature of the fluid within the inlet manifold, an atmospheric pressure sensor to provide an indication of an atmospheric pressure, and a control module in communication with each of the sensors. The control module is configured to monitor an engine valve opening duration and an exhaust gas recirculation valve position, and estimate a compressor inlet pressure based on the provided indications, the monitored duration, and the monitored position.