Cloud computing is an emerging technology the way that organizations manage their data, owing to its attractive features such as robustness, low cost, and ubiquitous nature. However, privacy concerns arise whenever sensitive data is out-sourced to the cloud where the data is processed and stored. The fact that users no longer have physical possession of the outsourced data makes it a formidable task to achieve the data confidentiality and integrity. As the data, in most cases encrypted, have to be not only stored, but also processed in clouds, the cryptography-based data confidentiality and integrity protection approaches are not adequate to satisfy the security requirements. Proxy re-encryption serves as a promising solution to secure the data sharing in the cloud computing. It enables a data owner to encrypt shared data in cloud under its own public key, which is further transformed by a semi-trusted cloud server into an encryption intended for the legitimate recipient for access control. To achieve a flexible and fine-grained access control on the outsourced data in cloud environment, in this paper we design a functional encryption system.

Cloud Computing Component, Privacy-Preserving methods, Privacy-Preserving Algorithms

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