Ransomware is a type of malicious malware software designed to gain unauthorized access . It is designed to extort money by blocking access to files or the computer system until the ransom is paid. Paying the ransom doesn't always guarantee that the files will be recovered, the system restored, or not getting extorted again. Cryptocurrency is the existing currency of cyber-crime like darknet markets or ransomware.(A cryptocurrency is a digital asset designed to work as a medium of exchange that uses strong cryptography to secure financial transactions, such as Bitcoin).