A Secure Integrated Cloud Storage Framework Using Lorenz Chaotic Key Generation, AES-256-GCM, and PBFT-Based Blockchain Verification

Cloud storage security remains a major challenge owing to threats related to confidentiality, integrity, and unauthorized access. In this study, a novel secure cloud storage system is proposed by integrating Lorenz 3D chaotic key generation, AES-256-GCM authenticated encryption, and blockchain verification based on PBFT. High-entropy keys were generated using the Lorenz chaotic system and then passed through SHA-256 to create secure 256-bit AES keys. The data is encrypted using the AES-256-GCM algorithm and stored in the cloud, and integrity metadata is stored in a blockchain that offers tamper detection, auditability, and Byzantine fault tolerance. The experimental results demonstrate strong cryptographic performance with near-ideal entropy (7.99), a high avalanche effect (50.05%), successful NIST randomness validation, and low blockchain overhead. The results of the security analysis prove resistance against brute force, statistical, differential, replay, known plaintext, chosen ciphertext, and Byzantine attacks. The proposed framework offers a secure, efficient, and reliable multilayered security solution for cloud storage systems.

@article{Baliram2026,
  title     = {A Secure Integrated Cloud Storage Framework Using Lorenz Chaotic Key Generation, AES-256-GCM, and PBFT-Based Blockchain Verification},
  journal   = {International Journal of Advanced Computer Science and Applications},
  volume    = {17},
  number    = {6},
  year      = {2026},
  publisher = {The Science and Information Organization},
  author    = {Walde Rajesh Baliram and Bashir Alam and Mohammad Najmud Doja},
  doi       = {10.14569/IJACSA.2026.0170650},
  url       = {https://doi.org/10.14569/IJACSA.2026.0170650}
}