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Ransomware (malware)
Ransomware is a type of malware that uses a weak (breakable) cryptosystem to encrypt the data belonging to an individual, demanding a ransom for its restoration. A cryptovirus, cryptotrojan or cryptoworm on the other hand employs a military-grade hybrid cryptosystem to take data hostage (the field known as cryptovirology predates the term "ransomware").
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