IoT privacy for the transmission of data in the field of health using blockchain

Data transmission and storage through blockchain is something that many studies have suggested for various security issues.Due to the sensitivities in securing information from patients and medical 1403 3 61 150 professionals, the healthcare system has a favorable context for deploying a powerful blockchain system for privacy.Blockchain application in the healthcare system allows physicians to store patient records with high security and make them available to other hospitals and clinics as needed.Besides increasing data transmission and storage security, this reduces data management risks and expenses.The present study emphasizes the confidentiality of healthcare data in the cloud-based Internet of Things (IoT) using blockchain and edge computing.Also this method uses SHA2 hashing and PKI encryption.Therefore, it can optimally provide data confidentiality in medical settings, especially for patients under care.The system proposed in this study includes five parts: users, IoT devices, edge devices, security server, and cloud computing.The proposed method uses the Diffie -Hellman key exchange in the authentication process for anomality case to achieve the goal of essential security compliance.This method is a cryptographic (encryption) protocol allowing two people or two organizations to create a shared password key without the need for any prior acquaintance and exchange it through an insecure connection path.This study used data sensed by IoT network sensors with medical data for loading on IoT and cloud simulated networks.These data were related to monitoring patients with cardiovascular disease and were sampled on 300 patients.The research dataset belonged to the Cleveland Clinic Foundation for Heart Disease Dataset.The study simulation software was NS-2.35, which used C++ and TCL programming languages.The research findings revealed that if there were no method for data encryption, much of the data would be exposed.This rate reaches 50% for 50 attackers.Encryption using the proposed method causes the percentage of data disclosed to be very slight, and it equals zero, even though attackers may guess the password or data.As network traffic grows, the throughput difference between blocking and non-blocking access methods increases.It suggests that by blocking the attacking nodes' access, network traffic will not have a detrimental effect on attacking nodes by detecting and preventing their activity.However, if the access of these nodes is not blocked, the destructive impact is very high, and the network traffic will grow slightly.According to these results, in terms of SLA violation, the system is in a situation where even in case of an attack, there is no SLA violation and the efficiency is maintained.Also, the percentage of access to useful information by the hacker will be close to zero.By preventing the entry of malicious nodes, the throughput increases by about 30%.Some other advantages of this method are its high flexibility and comparability, robustness, and relatively low execution time and delay, which is caused by the use of cloud edge.It is estimated that the improvement rate of the proposed method is more than 5% compared to other related approaches.In the design presented in this study, the processes are highly simplified, and there will be a relatively low processing overhead.At the same time, the steps meet all the requirements for cloud and IoT data centers in healthcare applications.