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Dynamic AES Encryption and Blockchain Key Management

DHARSHINI.M
Department of Computer Science – PG
Kongunadu Arts and Science College
Coimbatore – 641029

Dr.R.SARAVANA MOORTHY

Associate Professor & Head,

Department of Computer Science (SF)

Coimbatore – 641029

ABSTRACT:The rapid growth of cloud computing has raised serious concerns about data confidentiality, integrity, and secure access control. Traditional cloud security models often depend on centralized trust and static encryption keys, which are vulnerable to insider attacks, key leakage, and unauthorized access. To address these issues, the proposed system introduces a secure cloud framework based on Dynamic AES encryption and blockchain-based key management, implemented using Python and the Django framework to ensure end-to-end protection of cloud-stored data. In this system, each uploaded file is encrypted using a unique, randomly generated AES key, preventing cross-file dataexposure even if one key is compromised. Biometric-based authentication using fingerprint hashing strengthens access control by adding an additional security layer beyond traditional username–password mechanisms. Furthermore, a role based administrative approval workflow ensures that only verified and authorized users can upload or access encrypted files, enhancing overall system trust and preventing unauthorized entry. Encrypted files are stored securely on cloud infrastructure such as Google Drive, while encryption keys are transmittedseparately to minimize single-point-of-failure risks. The framework also supports blockchain integration for immutable logging of key references and access transactions, ensuring transparency, tamper resistance, and accountability. Overall, the proposed solution delivers a scalable, secure, and reliable cloud data protection model suitable for sensitive applications like healthcare, finance, and enterprise data management.
KEYWORDS:AES, blockchain, cloud computing, cloud storage, dynamic encryption, ECC.