A Note on 'IPad: ID-Based Public Auditing for the Outsourced Data in the Standard Model'

摘要

Cloud storage is an increasingly popular data storage manner which allows cloud data owners to outsource their data to the cloud for storage and maintaining. However, users will lose their physical control over their data after their data are outsourced to the cloud. To ensure the integrity of data stored in the cloud, many public auditing schemes have been proposed. Recently, Zhang et al. proposed an ID-based public auditing scheme for the outsourced data in the standard model. In this note, we prove this scheme is not secure. We show that the malicious cloud can pass the auditor's verification even if it has deleted or modified the users' data in this scheme.