Attribute-Based Encryption Scheme for Secure Multi-group Data Sharing in Cloud

Directly revocable attribute-based encryption (ABE) is a good fit for secure group data sharing in cloud. However, existing schemes fail to provide any effective solution for secure multi-group data sharing scenario. This is important because many organizations that are potential users of the cloud based data sharing platform are multi-group in nature. To bridge this gap, we first propose Revocable ABE with Verifiable Outsourced decryption (ReVO-ABE)- a directly revocable ABE scheme that allows any number of user revocation and joining without affecting secret membership keys of the non-revoked users. Based on ReVO-ABE, we build a Dynamic Multi-Group Secure Data Sharing scheme called DMG-SDS. Operations that are exclusive to multi-groups like groups merge and split, on-demand cross-group data sharing can be performed without affecting the attribute secret keys or membership keys of the non-revoked users that is not possible with any existing scheme.

Researcher

Md. Azharul Islam