The growing adoption of digital medical health care systems makes it necessary to build efficient, secure, and interoperable medical information exchange services. Nevertheless, existing traditional healthcare systems are centralized, inefficient in communication, vulnerable in terms of the integrity of data, and lack transparency. In this study, a novel blockchain-based secure framework is proposed with the integration of Ethereum smart contracts, CBOR compression, AES-256 GCM encryption, and SHA-256 validation. A multispecialty hospital dataset including patients’ information, laboratory information, prescriptions, and billing details is used in testing. A study obtained a compression rate of 7.22, validation speed of 0.0039 ms, encryption in 0.36 ms, average API latency of 98.47 ms, and throughput capacity of 52.9 TPS with a blockchain-based proposed system. Security analysis proved that this system provides security in terms of encryption, tamper resistance, access control, and immutability. The study also contributes a new model of communication within the health sector, which is both lightweight and secure, and increases blockchain performance and security.
The ubiquity of lightweight resource-constrained Internet-of-Things (IoT) devices in 5G smart environments necessitates authentication protocols with the conflicting goals of being lightweight, highly secure, and having a decentralised credential management structure. Existing schemes use trusted third-party key distributors or heavyweight cryptographic primitives infeasible to IoT embedded hardware; they also fail to anchor device credentials on a permissioned blockchain ledger for tamper-evident credential revocation. In this work, we introduce BLAP-IoT: a Blockchain-Assisted Lightweight Authentication Protocol over live Hyperledger Fabric 2.5.9 that leverages elliptic-curve Diffie–Hellman over P-256 curve, keyed MACs, and a three-message challenge-response protocol to provide injective mutual authentication with device key confirmation. Device credential commitments are stored on-chain to facilitate decentralised and efficient device revocation without revealing secrets on-chain. A formal security verification of the protocol in ProVerif 2.05 shows session-key secrecy, injective mutual authentication, and perfect forward secrecy in the presence of the Dolev-Yao attacker. The empirical evaluation of BLAP-IoT on measured P-256 primitives reports that the scheme achieves a total computation cost of 0.303 ms on constrained devices — up to 52% less than compared schemes, 1920-bit two-way communication overhead, and 0.218 mJ device energy consumption. The underlying blockchain layer sustains up to 277 transactions per second (TPS) in peak throughput, with end-to-end authentication latency less than 13 ms at 1000 concurrent devices.