One of the biggest security problems and forms of cybercrime today is ransomware. This type of malware encrypts files so that they cannot be accessed without a decryption key. The attackers then ask for payments in cryptocurrency to provide targets with the decryption key, usually within a short time frame to put more pressure on the targets.

Check for available decryption tools - In case you are a target of ransomware, the general advice is not to pay, as there is no guarantee you will indeed receive the correct decryption key. Payments also encourage further cybercrime attempts. You can try to find a decryption tool based on the type of ransomware. For example, No More Ransom is an initiative that provides citizens with free decryption tools for many forms of ransomware. Most ransomware targets are large companies, but individuals should be aware of the dangers and consequences too.

Restore backup - Depending on which data you cannot access, you should try to restore your files from a backup. Make sure your files are backed up regularly and that you can access the backups in case they are kept on some cloud-based service (e.g. Proton Drive, Dropbox, Tresorit).

Restore system - In case the operating system of your device suffered serious damage affecting its performance, it is advisable to restore it to the last configuration when it was fully functional. Windows has the System Restore option, and MacOS can use the Time Machine, while for Linux systems there are many available restore backup tools.