Wikipedia
Ransomware is a type of malware from cryptovirology that threatens to publish the victim's data or perpetually block access to it unless a ransom is paid While some simple ransomware may lock the system so that it is not difficult for a knowledgeable person to reverse, more advanced malware uses a technique called cryptoviral extortion It encrypts the victim's files, making them inaccessible, and demands a ransom payment to decrypt them In a properly implemented cryptoviral extortion attack, recovering the files without the decryption key is an intractable problem – and difficult to trace digital currencies such as paysafecard or Bitcoin and other cryptocurrencyies are used for the ransoms, making tracing and prosecuting the perpetrators difficult
Ransomware - Wikipedia, the free encyclopedia