SCRAMBLING/DESCRAMBLING METHOD OF DATA-TO-BE-PROCESSED OF SEMICONDUCTOR DEVICE, ITS PROGRAM, SCRAMBLING/DESCRAMBLING CIRCUIT, AND SEMICONDUCTOR DEVICE PROVIDED WITH THEM

摘要

PROBLEM TO BE SOLVED: To provide an encryption method of a data-to-be-processed of a semiconductor device which is excellent in a bus probing resistance, and its semiconductor device or the like.;SOLUTION: In the encryption method of the data-to-be-processed of the semiconductor device, an initial value of a key data to become a key for the encryption is placed in a storage portion outside a CPU. A generation of the key data and a scrambling/descrambling processing of the data-to-be-processed using the key data are achieved by using a general-purpose register inside the CPU or by a scrambling/descrambling circuit as a hardware. It is excellent in the bus probing resistance as the key data does not flow out to a peripheral bus therefor.;COPYRIGHT: (C)2007,JPO&INPIT