Fine-Grained Collaborative Access Control for IPFS with Efficient Revocation

Access control is important for IPFS and collusion resistance is a basic requirement in traditional attribute-based encryption (ABE). However, in many emergency situations, conditional collaboration between multiple users is needed to decrypt ciphertext data. In addition, in order to make access control mechanisms suitable for the change of user attributes, it is necessary to construct ABE schemes that support attribute revocation. In this paper, a fine-grained collaborative decryption scheme that supports attribute revocation in IPFS storage (GORE-ABE) is proposed. In this scheme, the tree access policy is adopted, and the users are divided into different groups. The premise for successful decryption is that the users participating in the collaboration are in the same group and that the user attribute set satisfies the tree policy. The analysis results show that the GORE-ABE scheme is secure and efficient.