A Lightweight Blockchain to Secure Data Communication in IoT Network on Healthcare System.

The burgeoning domain of the Internet of Things (IoT) encompasses a myriad of interconnected devices tasked with the automated collection of sensitive data. A paramount challenge within this realm is the establishment of stringent security protocols to safeguard sensitive information and thwart unauthorized access. Although various strategies have been conceived and implemented to fortify data protection in IoT environments, the unique resource limitations intrinsic to IoT devices necessitate further exploration. The criticality of efficient time and memory management for the optimization of IoT application performance cannot be overstated. This paper elucidates the efficacy of employing lightweight blockchain technology as a bulwark to secure numerous IoT applications. It introduces a symmetric cryptographic algorithm, known as Blowfish, tailored for the secure transmission of data within IoT networks. A novel key generation phase has been developed, demonstrating an adept utilization of time and memory resources on IoT devices for the encryption of transaction data. Furthermore, these transactions are recorded within a blockchain database, capitalizing on its inherent immutability. Comparative analysis reveals that the proposed scheme surpasses contemporary algorithms, including AES and 3DES, with regard to encryption time and memory overhead for key generation. This advancement heralds a significant stride in the quest to bolster IoT security [ABSTRACT FROM AUTHOR]