Aspects provide an authentication mechanism wherein processors are configured to extract encoded identification indicia of a cellular service base station from authentication credentials received from a mobile cellular device for access to a secure networked resource on a network device connection. The identification indicia uniquely identify the base station relative to other, different base stations. Configured processors grants access by the mobile device to the secure networked resource in response to determining that the mobile device is currently using the identified base station for cellular services to transmit the authentication credentials; and deny access by the mobile device to the secure networked resource in response to determining that the mobile device is currently using another base station for cellular services to transmit the authentication credentials.