A Novel Multi-Authority Access Control Scheme for Fine Grained Access to Users Data in The Cloud-Based Storage
Abubakar A..
Abdulrasheed N.
Surajo M.
Abstract
This study aims to improve data security and access control in cloud storage systems by introducing a novel hybrid RSA-AES encryption scheme based Ciphertext-Policy Attribute-Based Encryption (CP-ABE), which combines multiple levels of authority. Challenges including data confidentiality, resistance to collusion, and scalability are addressed by the proposed approach. Different sets of attributes are managed by multiple attribute authorities, which distributes trust and minimizes single points of failure. By using asymmetric encryption for keys and symmetric encryption for data, the CP-ABE combined with RSA-AES guarantees strong data protection. Only when a user's attributes align with the system's access policies can they decrypt data. Performance analyses show that even with an increase in users and attributes, the method is able to maintain low encryption and decryption times. Data confidentiality and resistance to collusion attempts are confirmed by security studies. Subsequent research endeavors will center on refining the computational efficiency of the proposed scheme and investigating the assimilation of blockchain technology to augment security and scalability within multi-authority settings. Especially for large-scale systems, our research provides a practical approach for safe data sharing in cloud environments.
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