Public auditing scheme for cloud-based wireless body area network

WBAN (Wireless Body Area Network) plays a fundamental role in telemedicine. However, due to the small size of sensor devices and weak capabilities in data processing/storage, WBAN is limited in application. In order to improve the ability of WBAN system and provide a richer service, the cloud-assisted WBAN has been proposed. Recently, He et al. proposed a method to check the data integrity in cloud-assisted WBAN. However, we found that in their scheme, the cloud server (storage service provider) can access the user's medical information directly. As we know, the cloud service provider can be divided into three kinds: public cloud, private cloud and hybrid cloud. Except of the private cloud, the cloud server should be considered as not trusted in the other two situations. Based on this assumption, in this paper, we proposed a certificateless public auditing scheme with privacy preserving and revocation in group sharing data model. Compared with He et al.'s scheme, the cloud server can not access any useful information from the stored data. Furthermore, our scheme supports properties of multi-user sharing data, public auditing, forward security and revocation of illegal group members.