Proxy re-encryption for privacy enhancement in Blockchain: Carpooling use case

Blockchain is an especially promising and revolutionary technology that brings transparency in a scalable way for multiple organizations and this is thanks to its several features. There are some exciting blockchain features but among them, decentralization is undoubtedly the most interesting one. Organizations can share data within a distributed ledger. As a consequence, each one can access synchronized data stored in its local Blockchain node. This functionality improves transaction tracking and facilitates access to data within a private group of organizations. However, in some cases, even if organizations accept to share data, they require to hide some private information related to their users or their business model. To tackle privacy and trust issues between organizations, this paper presents a blockchain architecture based on the proxy re-encryption scheme. This scheme is integrated within smart contracts to provide a very efficient, fast, and secure platform. The proposed architecture is implemented in an Hyperledger Blockchain and tested in a real transport and mobility use case.