Cryptanalysis of Yang et al.’s Handover Authentication Scheme for Mobile Network Environment

Due to the progress of mobile computing andcommunication technologies, people are easily using their mobiledevices doing lots of applications through wirelesscommunication. Lots of information and personal data aretransmitted through the network. Therefore, to protect thesedata and resist unauthorized access is an important issue. Basedon mobile cloud computing environment, Yang et al. proposed asecure, private, and efficient handover authentication scheme formobile devices and access points. But there still exist somesecurity weaknesses. Their proposed scheme doesn’t fully satisfyuser untraceability, even forward and backward secrecy. Ourproposed scheme solves these defects, achieves mutualauthentication, data integrity, user anonymity, useruntraceability, forward and backward secrecy, and resist replayattack.