Ambient power device-initiated secure communications using wireless backscattering

A method comprising:

• receiving, by a powered wireless device, from an ambient power (AMP) device, an ID response frame comprising an identifier (ID) of the AMP device, a session ID, and one or more first authentication and key management (AKM) parameters;
• generating, by the powered wireless device, one or more second AKM parameters;
• encrypting a command, by the powered wireless device, using the one or more first AKM parameters and the one or more second AKM parameters;
• and
• transmitting, by the powered wireless device, to the AMP device, a data request frame comprising the one or more second AKM parameters and the encrypted command.

A system comprising:

• an ambient power (AMP) device comprising:
• an AMP collection circuit configured to harvest environmental energy;
• at least one antenna;
• and
• a first processing device coupled to the AMP collection circuit and the at least one antenna, the first processing device configured to:
• determine a secret that is shared with a powered wireless device;
• determine, using the secret, one or more first authentication and key management (AKM) parameters;
• cause the at least one antenna to transmit an ID response frame comprising an identifier (ID) of the AMP device, a session ID, and the one or more first AKM parameters;
• receive, via the at least one antenna, from the powered wireless device, a data request frame comprising one or more second AKM parameters and an encrypted command;
• and
• decrypt, using the one or more first AKM parameters and the one or more second AKM parameters, the encrypted command.