Patent ID: 9729332
Date: 2017-08-08
CPC Classifications: G06F,H04L

Claim:
1. An authentication method, in a household device authentication system including a first controller connected to a first server via a first network, a second controller connected to a second server via a second network, and a device connected to the first controller and the second controller, the authentication method performing authentication between the device and the first controller or between the device and the second controller, the authentication method comprising: acquiring, by the device and via one of a plurality of networks, a first certificate revocation list from the first controller, the first certificate revocation list including first time information indicating a next issue date of the first certificate revocation list; acquiring, by the device and via an other of the plurality of networks, a second certificate revocation list from the second controller, the second certificate revocation list including second time information indicating an issue date of the second certificate revocation list; comparing, by the device, the first time information and the second time information to determining whether the first controller is invalid; and one of disconnecting and disabling, by the device, a connection with the first controller in response to a determination that the first controller is invalid based on the comparing of the first time information and the second time information, wherein the first certificate revocation list and the second certificate revocation list are each associated with a certificate of the first controller, a certificate of the second controller, and a certificate of the device, and the first certificate revocation list is acquired from the first controller before the second certificate revocation list is acquired from the second controller.