Fine-Grained Access Control with User Revocation in Smart Manufacturing Gómez Marín, Ernesto Martintoni, Davide Senni, Valerio Castillo Morales, María Encarnación Parrilla Roure, Luis Industrial Internet of Things Access control Blockchain Attribute-based encryption Revocation Data-sharing Industry 4.0 This research has been founded by the European Union’s Horizon 2020 Research and Innovation program under grant agreement No. 871518, a project named COLLABS [19]. Collaborative manufacturing is a key enabler of Industry 4.0 that requires secure data sharing among multiple parties. However, intercompany data-sharing raises important privacy and security concerns, particularly given intellectual property and business-sensitive information collected by many devices. In this paper, we propose a solution that combines four technologies to address these challenges: Attribute-Based Encryption for data access control, blockchain for data integrity and non-repudiation, Hardware Security Modules for authenticity, and the Interplanetary File System for data scalability. We also use OpenID for dynamic client identification and propose a new method for user revocation in Attribute-Based Encryption. Our evaluation shows that the solution can scale up to 2,000,000 clients while maintaining all security guarantees. 2023-07-28T11:37:02Z 2023-07-28T11:37:02Z 2023-06-27 journal article Gomez-Marin, E.; Martintoni, D.; Senni, V.; Castillo, E.; Parrilla, L. Fine-Grained Access Control with User Revocation in Smart Manufacturing. Electronics 2023, 12, 2843. [https://doi.org/10.3390/electronics12132843] https://hdl.handle.net/10481/84129 10.3390/electronics12132843 eng info:eu-repo/grantAgreement/EC/H2020/871518 http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional MDPI