FP2E: Flexible, effective and privacy preserving cloud data sharing scheme

The storage service is one of the most popular services in the cloud. This service allows outsourcing of data storage in service provider servers while having the ability to access it from different devices. Moreover, this service provides the ability to make data-sharing operations with one or more customers, which requires the implementation of a method to maintain data confidentiality while providing granular, scalable and flexible access control. For this reason, several schemes have been proposed. In this paper we propose a scheme, based on cipher-text policy attribute based encryption (CP-ABE), that is able to achieve the desired level of security while having a reduced computation overhead.