Authentication token and method of operating the same

A method of operating an authentication token, said token comprising:

• a communication unit for contactless communication between the token and an external device;
• an energy storage unit for storing energy;
• a biometric capturing unit configured to capture at least one biometric sample;
• a processing unit configured to processing the at least one biometric sample captured by the biometric capturing unit;
• and
• a synchronization unit;
• wherein the method comprises causing the synchronization unit to:
• determine a communication status of the communication unit;
• determine a power supply capability of the energy storage unit;
• and
• adjust a processing speed of the processing unit in dependence on said communication status and said power supply capability.

A computer program product comprising a non-transitory storage medium, the non-transitory storage medium comprising executable instructions configured, when executed by processing circuitry of an authentication token, to cause the authentication token to:

• determine a communication status of a communication unit coupled to the processing circuitry;
• determine a power supply capability of an energy storage unit of the authentication token;
• receive at least one biometric sample from a biometric capturing unit of the authentication token coupled to the processing circuitry, the at least one biometric sample including at least one biometric feature representing an individual's identity, wherein the at least one biometric feature comprises a physical characteristic unique to the individual;
• and
• determine a processing speed with which to process the at least one biometric sample based on the communication status and the power supply capability;
• and
• process the at least one biometric sample in accordance with the determined processing speed.