OSL-ABE: an optimal secure and lightweight attribute-based encryption method for blockchain-enabled IoT-based healthcare systems

A secure IoT system can provide end-to-end encryption, secure communication protocols, mechanisms for access control, and intrusion detection and prevention systems to protect against various cyber threats. This paper presents a novel method to guarantee the secured and privateness of information in healthcare system that is Internet of Things based. This proposed method, called optimal secure and lightweight attribute-based encryption (OSL-ABE), is designed to provide an efficient and effective solution for secure data storage in the blockchain. By leveraging ABE, this method enables fine-grained access control over data, ensuring that only authorized users with specific attributes can access the data. Current ABE systems, including those used in IoT applications, often neglect privacy protection, during the key generation phase which is a significant threat to confidentiality of industrial secrets. Therefore, an optimal key generation method is proposed using modified sandpiper optimization (MSO) algorithm to ensure privacy preservation. In addition, it is incorporated with an enhanced gravitational search (EGS) algorithm in this proposed method to facilitate secure key revocations. It uses a single short broadcast message, which helps to maintain the IoT systems with confidentiality and integrity. Based on the simulation results, NPCR and UACI results exhibit 99.76% and 34%, respectively, and the entropy value is also obtained with a safe value of 8 which can withstand brute force attacks; it is found that the OSL-ABE method provides a comprehensive and effective solution for ensuring data security, preserving privacy, and facilitating secure key revocations in blockchain-enabled IoT-based healthcare systems.