Patent ID: 8881974

Claim:
A secure electronic entity, adapted to be connected to a host station, said secure electronic entity containing means for measuring time and comprising certification means for certifying a date of receipt of a command from said host station and synchronization means adapted, upon receipt of a message from said host station, to store a value in a register, wherein said value representative of a reference time is provided by a server, wherein the time measuring means carry a charge representative of an elapsed time so as to be adapted to supply a measurement of time when said electronic entity is not supplied with electrical power, wherein means are provided for determining a current time as a function of the charge and the value representative of the reference time stored in the register of the electronic entity, and wherein said certification means receives from said time measuring means information on elapsed time and produces data certifying said date, relative to said current time, intended for an external entity in reference to said information on elapsed time and to said value representative of the reference time.