Anonymous and Privacy Preserving Attribute-Based Decentralized DigiLocker Using Blockchain Technology

DigiLocker is an Aadhaar-based sharable public cloud service from Government of India. Similar to other centralized services, DigiLocker may operate the system to its full discretion which may not be fully aligned with the expected usage policy. Though DigiLocker ensures data integrity and secure data access, privacy and anonymity related concerns are yet to be addressed in full. For example, an adversary may trace a user based on encrypted communication messages from him/her. This paper presents a privacy preserving blockchain-based DigiLocker service which may address these challenges effectively using attribute-based encryption and blockchain technology.