APPARATUS SAFE FROM POWER CONSUMPTION ANALYSIS ATTACK FOR ENCRYPTING AND METHOD FOR OPERATING SAME

摘要

An apparatus for encrypting and a method for operating the apparatus for encrypting are provided. The apparatus for encrypting comprises an encryption module for carrying out an encryption algorithm. In a first state corresponding to a time duration before the encryption algorithm is carried out, a first charge conveying unit, which is included in the apparatus for encrypting, receives power from an exterior power source and stores same in a charge storage unit, which is included in the apparatus for encrypting. In a second state corresponding to a time duration during which the encryption algorithm is carried out, a second charge conveying unit, which is included in the apparatus for encrypting, conveys the charge that is stored in the charge storage unit to the encryption module. Also, in a third state corresponding to a time duration after the encryption algorithm is carried out, the charge storage unit discharges a charge storage element, which is included inside the charge storage unit, for storing charge. Whereas in the second state, the first charge conveying unit blocks a ground terminal of the encryption module so as not to be connected to the ground terminal of the external power source.