Privacy-Preserving Data Dissemination in Untrusted Cloud.

B2B (business-to-business) systems often use service-oriented architecture (SOA) with decomposed business services. These services can interact and share data among each other. Service might use a cloud – hosted database, such as a non - relational encrypted key – value store. However, the cloud platform hosting the database can be untrusted. Data owner needs to be sure that each service can access only those segments of a shared database for which the service is authorized. Furthermore, data requests can come from a service also hosted by untrusted cloud. Hence, there is a need for designing a cloud enterprise framework that can ensure privacy-preserving data dissemination in SOA and accurately detect data leakages. We design and prototype a solution that ensures privacy – preserving dissemination of data. The solution is based on (a) role-based access control, (b) cryptographic capabilities of clientu0027s browser, (c) authentication method, (d) subjectu0027s trust level. The prototype enables privacy – preserving dissemination of Electronic Health Records (EHRs) hosted in an untrusted cloud.