Device safe from attacks of power consumption analysis for encryption and method to operate the same

摘要

An encryption apparatus, comprising: an encryption module for executing an encryption algorithm, a control module adapted to transfer, to the encryption module, a load supplied by an external power source by controlling a path of passage of current between the encryption module and the external power supply, at least in a period of time prior to the execution of the encryption algorithm and in a period of time during which the encryption algorithm is executed; characterized in that the control of a current path between the encryption module and the external power supply comprises disconnecting a ground terminal from the encryption module of a ground terminal from the external power supply in the period of time during the The encryption algorithm is executed.