Embodiments of the disclosure provide a method, device and computer readable medium for authentication. According to embodiments of the present disclosure, only the first terminal device in a group of terminal devices which requests to connect to a network needs to finish the whole authentication. Upon the first terminal device successfully accesses to the network, the remaining terminal devices in the same group can ignore the authentication. In this way, time for authentication is reduced and the calculation efforts related to authentication is reduced for a large number for terminal devices.