3.2.5. Group manager
It enables secure and privacy-preserving data sharing, with groups of entities which satisfy specific identity attributes values. To this aim, the group manager is based on the Ciphertext-Policy Attribute-based Encryption (CP-ABE) scheme [12], enabling entities with full control over how their information is disseminated to other entities. Such dissemination is also influenced by trust and reputation values, as well as contextual information where the sharing transaction is being per- formed.