Cloud-Based Secure Electronic Medical Data Sharing System Using Blockchain Technology (Simulation of a Ransomware Attack with OWASP)

Attacks using ransomware are increasing, putting current healthcare institutions and other crucial infrastructure at risk. The current healthcare administration systems could be a soft target, as evidenced by cyberattacks such as WannaCry incident in 2017, that affected just over one third of NHS trusts PCs and over 250,000 workstations in the majority of countries in the world. The finding from this study shows that sharing medical data on blockchains in the cloud is resistant to ransomware attacks because from the proof-of-concept application built and the ransomware attack carried out, it was discovered that the ransomware can harm a node and might make it unavailable, it cannot spread to other nodes since each node is physically isolated from the other. Hence the concurrent processing and distributed nature of the cloud make its security unassured. As medical data is especially susceptible to security flaws and assaults such as forgery, tampering, and privacy leaks, the blockchain has been utilized in the cloud to protect and secure it.