A network device receives credentials of a user of a client device, and receives an enrollment request from the client device, wherein the enrollment request includes a network address of the client device. The network device generates a token comprising the network address and an identifier of the user, encrypts the token, and sends the encrypted token to the client device. The network device receives, when the client device attempts to access a protected resource or a network service, the encrypted token from the client device for authenticating the client device without further requiring the credentials of the user.