Authentication and privacy protection are important security mechanisms for keeping things safe in the Internet of Things environments. In particular. an anonymous authentication scheme is a privacy preserving authentication technique which provides both authentication and privacy preservation. An authentication scheme with anonymity in mobility networks was proposed recently. https://www.nacrack.com/amazing-price-1997-2000-BMW-528I-Front-Bumper-Reinforcement-Bar-Used-Original-Exterior-OEM-great-save/