Authentication of multiple mobile devices by the same target device in an ultra-wideband system

A method comprising:

• broadcasting parameters associated with a first authentication value from an ultra-wideband (UWB) system of a target device, the parameters being sufficient to derive the first authentication value at a plurality of mobile devices;
• receiving a plurality of second authentication values at the UWB system from the plurality of mobile devices;
• and
• receiving a ranging data set for each valid second authentication value from a target secure element at the UWB system, the ranging data set being used to authenticate a mobile device associated with the valid second authentication value for secure communication.

A target device comprising:

• a secure element to run at least one application and store data;
• and
• an ultra-wideband (UWB) system operably coupled to the secure element, the UWB system being configured to:
• transmit and receive signals over a specific frequency range;
• broadcast parameters associated with a first authentication value, the parameters being sufficient to derive the first authentication value at a plurality of mobile devices;
• receive a plurality of second authentication values from the plurality of mobile devices;
• and
• obtain a ranging data set for each valid second authentication value from the secure element, the ranging data set being used to authenticate a mobile device associated with the valid second authentication value for secure communication.