| Summary: | When user stores their data in the cloud storage, they most concern about whether the data is complete, privacy and unchanged. To ensure the availability and integrity of usersˊ stored data, cloud server must prove a verifier that it is actually storing all of a clientˊs data unchanged. And, enabling public auditability for cloud storage is of critical importance to users with constrained computing resources, who can resort to a third party auditor to check the integrity of outsourced data. However, most of the existing auditing schemes do not consider data privacy problem. In this paper, after giving a new construction of a recently proposed primitive named aggregatable signature based broadcast encryption scheme, we present an efficient public auditing scheme with privacy property. The new scheme is secure in the random oracle model and has less computation cost than existing auditing scheme with privacy property.
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