公开(公告)号：US20210314077A1

公开(公告)日：2021-10-07

申请号：US16838784

申请日：2020-04-02

Applicant: ABB Power Grids Switzerland AG

Inventor： Danu Tjahjono ,  Rafiq Shaikh ,  Ajay K. Dassu

IPC: H04J3/06 ,  H04L29/06

Abstract: Exemplary of embodiments of the disclosure include a method which includes determining, by a first device, whether the first device has a current time and transmitting a request for the current time to a second device if the first device does not have the current time. The second device is in a local network. The method further includes receiving, by the first device, the current time from the second device, authenticating a certificate based on the current time received from the second device, and establishing a network connection to the local network based on the authenticated certificate.