Methods, systems, apparatuses, and devices are described for authenticating in a network. A mobile device may establish a group account with an authentication server associated with the group. Upon successfully completing group account establishment, the mobile device receives a group authentication token that includes information associated with the authentication server, the group, the mobile device, a group key, versioning information, etc. The mobile device may use the group authentication token to authenticate with another mobile device that is a member of the same group. The versioning information may support backwards-compatibility between the group authentication tokens having different versions.