Attribute-based data retrieval with semantic keyword search for e-health cloud

Data retrieval on encrypted documents is a very important technology in cloud storage, where encryption on sensitive data is a necessary operation to protect documents privacy before they are outsourced to cloud. Most of existing searchable encryption schemes concentrate on single-user scenario. In this paper, we focus on the multiple sender and multiple user application scenario to provide a flexible search authorization searchable encryption (SE) scheme. The attribute based encryption (ABE) technology is used to support fine-grained access control and the synonym keyword search is enabled in the new scheme. The new primitive is named as attribute based searchable encryption with synonym keyword search function (SK-ABSE). The formally definition of SK-ABSE is given together with a concrete construction. This scheme also enables convenient user revocation mechanism.