Ransomware is a sophisticated piece of malware that blocks the victim’s access to his/her files, and the only way to regain access to the files is to pay a ransom.
There are two types of ransomware in circulation:
Encrypting ransomware, which incorporates advanced encryption algorithms.
It’s designed to block system files and demand payment to provide the victim with the key that can decrypt the blocked content.
Examples include CryptoLocker, Locky, CrytpoWall and more.
Locker ransomware, which locks the victim out of the operating system, making it impossible to access the desktop and any apps or files.
The files are not encrypted in this case, but the attackers still ask for a ransom to unlock the infected computer.
Examples include the police-themed ransomware or Winlocker.
https://en.wikipedia.org/wiki/Ransomware
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