Patent ID: 9467323
Filing Date: 2016-10-11
CPC Classification: G06F,H04L

Claim Text:
1. A control method of a communication device that performs server authentication and inspects a server certificate, which is a digital certificate with a set validity period, when connecting to a network, the control method comprising: the communication device storing time information and status information, which indicates whether the time information is a provisional time or verified time; doing a first authentication that determines during server authentication if the time indicated by the time information is before the start time of the validity period, during the validity period, or after the validity period ends; stopping connecting to the network using the server certificate if the first authentication determines that the time indicated by the time information is after the validity period ends; attempting a second authentication that inspects other authentication information included in the server certificate if the first authentication determines that the time indicated by the time information is during the validity period; executing a preset process based on the status information if the first authentication determines that the time indicated by the time information is before the start time of the validity period and the status information is set to provisional time; and stopping connection to the network if the first authentication determines that the time indicated by the time information is before the start time of the validity period and the status information is set to verified time.