Optimal Key Generation and Secure Authentication Scheme for Data Sharing and Access Control in Blockchain Cloud Systems

Due to the design of network technologies and technical emergence, the cloud has altered the manner in which data are mutual. It offered persons and organizations several services which facilitate the users to easily access the data and resources. However, the cloud enables huge efforts in ensuring the sharing of data, but there exist security problems which should be addressed. This paper devises a Dwarf Mongoose Whale Optimization (DMWOA) model for performing the key generation. The data sharing model is formed between different entities, such as blockchain, Data User (DU), Data Owner (DO), Attribute Authorities (AAs), Certificate Authority (CA), and Cloud Service Provider (CSP). The data sharing model embedded with authentication is necessary for improving the security of the cloud in blockchain. In addition, the authentication approach involves several processes, namely system initialization, registration, key generation, authentication, Data Access control, encryption, token generation, and decryption. Besides, it builds joint trust among different AAs using blockchain, and it uses smart contracts. The method outperformed with a small memory of 96.00[Formula: see text]MB, detection rate of 0.929, and computation time of 7.002[Formula: see text]s.