Towards unbreakable cloud security: Symmetric key cryptography and blockchain synergy
Khushabu Agrawal, Gunjan Verma, Priya, Divya Sharma, Nidhi Pruthi · 2025
In the modern era, cloud computing has become widely utilized across various sectors, including information sharing in organizations, educational institutions, and military establishments. Its primary purpose is to efficiently manage extensive data repositories. The key advantage of cloud computing lies in its ability to provide ubiquitous and on-demand access to data, enabling users to retrieve information seamlessly from anywhere and at any time. However, this convenience also raises security concerns, especially when dealing with large volumes of data. To address this issue, this study introduces an innovative cryptographic algorithm based on symmetric cryptography principles. In the proposed algorithm, we implement the blockchain methodology to encrypt and decrypt the data based on the symmetric key algorithm. This algorithm empowers users with the knowledge of a confidential key, which is leveraged for both data encryption and decryption processes. By executing these operations at the user end rather than within the cloud storage infrastructure, the proposed method effectively strengthens data against diverse cyber threats. The proposed cryptographic approach fosters enhanced transparency between users and cloud service providers, concurrently security vulnerabilities.