Design and Implementation of New Collision Resistant Fast Hash Function Family for IoT Healthcare Blockchain Ledger

Health care is one of the many fields where blockchain technology is being put to use in new and creative ways. When it comes to the medical industry, blockchain technology is being utilised to store and share patient data across healthcare organisations. It is possible to discover severe errors in the medical field using blockchain technology, which may even be potentially lethal. As a result, medical data interchange may become more efficient, secure, and transparent. Medical facilities may acquire insight and improve their analysis of patient data with the help of this technology. Using blockchain technology, we show how IoT devices in the healthcare industry might be more secure.The development of a novel hash function is based on the Unpredictability principle. Given that the IoT has constrained resources and power, we employed an S-box of AES-256 with an XOR operator. We also created a collision-proof, lightweight, and fast hash function. The outcomes of the suggested hash functions are as follows: (256, 384, and 512).