Patent ID: 8103878
Filing Date: 2012-01-24
Classification: G06F,H04L

Abstract:
1. An update method of updating a program of a control device, for controlling the operation of a system according to the program, comprising: writing a new file converted from the program, into a memory; reading the new file and a digital signature for a part of the new file, the digital signature being attached to the new file; and verifying according to the digital signature, that the new file is not falsified, wherein: the program is divided into plural parts providing different processings, in which the part is at least one part of said plural parts and corresponds to a predetermined processing and is stored in a predetermined area of the memory as a portion of the stored file, where the predetermined processing is secured as an area which is unable to be updated, it is verified according to the read digital signature and the part of the new file, that the new file is not falsified, before the writing the new file into the memory for storing the files; and the file stored in the memory is rewritten as the new file.