An Medical Data A User Authentication Of A Cloud Data

Abstract

With the rapid adoption of cloud computing in healthcare, securing medical data stored and accessed through cloud platforms has become a critical priority. Unauthorized access to sensitive health records can lead to severe privacy violations and misuse of patient information. Therefore, robust user authentication mechanisms are essential to ensure that only legitimate users can access or modify medical data in cloud environments. This paper presents a secure and efficient user authentication scheme tailored for cloud-based medical systems, focusing on protecting data integrity and ensuring user privacy. The proposed scheme employs a multifactor authentication model that integrates otp verification, cryptographic credentials, and device-based factors to authenticate users accessing electronic health records (EHRs). To counter emerging threats, especially from quantum-capable adversaries, the protocol incorporates post-quantum cryptographic techniques, ensuring long-term security resilience. The protocol is formally verified using the ProVerif tool and evaluated against standard security criteria, demonstrating resistance to attacks such as replay, man-in-the-middle, insider threats, and stolen-verifier attacks. Furthermore, performance analysis confirms the protocol's low computational and communication overhead, making it suitable for real-time medical applications. The results highlight the protocol's ability to maintain a secure and scalable framework for confidential medical data access in cloud environments, balancing security, usability, and efficiency