SRAME : An Attribute based Message Encryption scheme with Keyword Search and Attribute Revocation

It is quite natural nowadays for data owner to outsource their business data to the cloud. The data such as business client information, electronic health record (EHR) are more inclined to shift storage and search operations to cloud servers. But there are three critical issues that need to be solved in the application process. Firstly, how to make data to be shared by different organizations in an efficient and privacy-preserving way? Secondly, whether it can still execute normal data query on those data if encrypted? Lastly but most importantly, How to guarantee the multiple-organization query is secure enough? In order to address those issues, in this paper, we adopt some technologies called Attribute-based Encryption (ABE), Complete Subset Difference (CSD) revocation and Multi-Key Searchable Encryption (MKSE) and thus propose a new architecture, called searchable and revocable attribute-based message encryption (SRAME). A thorough security and performance analysis shows that our design is secure and efficient. We believe our work explores a possible approach on how to build a secure multinational data sharing solution for cloud storage services.