Patent ID: 7707570
Filing Date: 2010-04-27
Classification: G06F,H04L

Abstract:
1. A communication method, executed on a communication system, which is constructed of a trusted information providing device that has a communication function and an information receiving device that has a communication function, wherein the communication system is configured such that information is provided from the trusted information providing device to the information receiving device; wherein a first communication operation is performed, in which the information receiving device communicates in response to an external call from a device representing itself as a correct information providing device; after which a first severing operation to cut the communication is performed to determine whether communication from the device representing itself as the correct information providing device can be verified as being communication from the trusted information providing device; after which a second communication operation is performed in which communication is carried out between the trusted information providing device and the information receiving device by the information receiving device calling the trusted information providing device using information providing device information that is stored and saved in advance in the information receiving device to determine whether the device representing itself as the correct information providing device is the trusted information providing device, and wherein in the second communication operation, information is provided from the trusted information providing device to the information receiving device, and after which a second severing operation is performed to cut the second communication operation after the information is completely provided from the trusted information providing device, wherein the information provided from the trusted information providing device to the information receiving device in the second communication operation is information for updating a version of a firmware of the information receiving device, and wherein the information receiving device is configured such that after receiving the information for updating the version of the firmware, a firmware overwriting operation is performed based on the information, wherein the device representing itself as the correct information providing device is set so as to notify the information receiving device of a password in the first communication operation, whereas the information receiving device is configured so as to return the password to the trusted information providing device during the second communication operation, and wherein the password that is notified from the device representing itself as the correct information providing device to the information receiving device in the first communication operation is invalidated after completion of an operation providing information from the trusted information providing device to the information receiving device in the second communication operation.