ENCRYPTION DEVICE SAFE TO ELECTRIC POWER ANALYSIS ATTACK AND OPERATION METHOD FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an encryption device safe to electric power analysis attack and an operation method for the same.;SOLUTION: An encryption device 100 contains an encryption module 110 for performing an encryption algorithm. Under a first state corresponding to a time section before the encryption algorithm is performed, a first charge transfer unit contained in the encryption device 100 is supplied with power from an external power source to store charges into a charge storage unit contained in the encryption device 100. Under a second state corresponding to a time section in which the encryption algorithm is performed, a second charge transfer unit contained in the encryption device 100 transfers the charges stored in the charge storage unit to the encryption module 110. Under a third state corresponding to a time section subsequent execution of the encryption algorithm, the charge storage unit discharges a charge storage element storing charges contained in the charge storage unit. Under the second state, the first charge transfer unit cuts off the connection so that the ground terminal of the encryption module is not connected to the ground terminal of the external power source.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2016,JPO&INPIT