PPADMA-ABE: a novel privacy-preserving and auditable attribute-based encryption under dynamic multi-authority setting
Zhifa Deng, Jiageng Chen, Shixiong Yao, Pei Li · International Journal of Applied Cryptography · 2024
Attribute-based encryption (ABE) enables a flexible approach to data storage in the cloud by allowing many users to encrypt data with attributes and ensuring that only authorised users with the matching attributes can access the data.However, the original ABE system is often static, which limits its flexibility.Therefore, we propose a novel attribute-based encryption with security auditing, dynamic multi-authority, and privacy-preserving (PPADMA-ABE) system that enhances the practicality and flexibility.Our scheme supports dynamic changes under the coexistence of multiple authorities and enables self-auditing to meet potential practical requirements.Additionally, we have outsourced a significant amount of user-side operations, which reduces the decryption cost at the terminal to a constant level.Finally, we prove that our scheme is secure against selective chosen-ciphertext attacks and can withstand collusion by malicious users or authorities.In summary, PPADMA-ABE provides a more practical and flexible solution for dynamic multi-authority ABE with privacy preservation.