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A BKQ-attacker has knowledge of both the outsourced data and queries that are executed.
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To provide a double layer of security, we apply both transformation and encryption techniques on the outsourced data.
While this approach has numerous advantages in cost and functionality, it is crucial that the outsourcing mechanism compromises the privacy of the outsourced data and the integrity of the computation, since the server in the cloud may not be fully-trusted.
However, cloud computing also raises security and privacy concerns since the users have no physical control over the outsourced data.
However, data dependency constraints (together with the unencrypted data) in the outsourced data may serve as adversary knowledge and bring security vulnerabilities to the encrypted data.
Most existing works follow the model of "Single Owner", which just supports searching on the outsourced data belong to only one data owner.
This indicates a need for cloud storage providers to adopt cloud integrity schemes to ensure the outsourced data is secured to gain trustworthiness from clients.
Multi-Authority Attribute-Based Encryption (MA-ABE) is an emerging cryptographic primitive for enforcing fine-grained attribute-based access control on the outsourced data in cloud storage.
Although, this helps to maintain the confidentiality of the outsourced data but achieving privacy is a difficult and resource intensive task.
As cloud computing becomes prevalent, more and more sensitive data is being centralized into the cloud, which raises a new challenge on how to utilize the outsourced data in a privacy-preserving manner.
attacker that can observe queries on the outsourced data.
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