The exponential growth of the Internet of Things (IoT) technologies requires high data security. Here, data security is very critical as all IoT devices transfer data over the Internet. The fine-grained access control provided by the ciphertext policy attribute-based encryption (CP-ABE) technique can be considered as a potential solution to this issue. However, most of the CP-ABE schemes use bilinear pairing operations for its internal working, which is expensive for any resource constraint device. An elliptic curve cryptography (ECC) based CP-ABE scheme can be well suited for resource constraint IoT framework because ECC takes less computational time. This article proposes a novel CP-ABE technique based on ECC to achieve fine-grained access control over data or resources. The proposed technique includes multiple attribute authorities to manage attributes and key generation, which can reduce the work overhead of having a single authority in traditional CP-ABE systems. In addition, the proposed scheme outsources the decryption process to a user assistant entity to reduce the decryption overhead of the end-users. To prove the efficiency of the proposed scheme, both formal security analysis and performance comparisons are presented in this article. The result and findings prove the effectiveness of the proposed scheme over some well-known schemes.

Blockchain technology provides a secure and reliable platform for managing data in various application areas, such as supply chain management, multimedia, financial sector, food sector,Internet of Things (IoT), healthcare, and many more. The recent emergence of blockchain with IoT provides significant growth in the healthcare industry to improve security, privacy, efficiency, and transparency with more business opportunities. Nevertheless, conventional healthcare schemes suffer from various security attacks like collusion, phishing, masquerade, etc. Therefore, a privacy-preservingDistributed Application (DA)is proposed in this paper using blockchain technology to create and maintain healthcare certificates. Here, the distributed application provides an interface between the blockchain network and system objects like healthcare centers, verifiers, and regular authorities to generate and issue medical documents. In addition, it also ensures security by specifying rules using various smart contracts. To evaluate the performance of the proposed scheme, various experimental tests are conducted using the Etherscan tool for measuring operation cost, latency, and processing time. Here, the efficiency of the proposed system is also compared to the existing systems in terms of latency, throughput, and response time. The experimental results and comparative analysis show that the proposed work is more efficient than the existing techniques.

Blockchain technology has been an emerging solution to various problems in the healthcare sector. Its applications in the healthcare sector range from securing patient data to increasing transparency in the pharmaceutical supply chain. Here, consumer electronic devices are used to collect and process healthcare data before uploading them to a blockchain network. Many schemes have been already developed using blockchain technology, Mobile Edge Computing (MEC), and consumer electronic devices to exchange Electronic Medical Records (EMR) efficiently. However, they face many critical concerns like data security, automation, and scalability. A novel blockchain-based EMR sharing scheme is proposed in this work to solve these problems. It protects the system during the entire Health Information Exchange (HIE) process between the patient and doctor. Here, consumer electronic devices and MEC are used to generate and upload EMRs and diagnosis reports. The proposed scheme utilizes Advanced Encryption Standard (AES), Rivest Shamir and Adleman (RSA), Edwards-curve Digital Signature Algorithm (EdDSA), Elliptic Curve Digital Signature Algorithm (ECDSA) techniques, and Inter-Planetary File System (IPFS) to securely store EMRs, so that they cannot be tampered with and are always available to authorized users. Experimental results of the proposed scheme show its efficiency compared to other existing well-known schemes.