The appearance of ransomware infections are to increase significantly during the year 2013. Ransomware firstly infects targeted computer, encrypts key data and requires high ransom to provide a user with decryption key. Some already investigated cases showed that $3.000 for a single key is not an exemption, especially while the ransomware blackmails users of sending their sensitive data to police. Such a malware is hard to disclose for users and contemporary statistics augur alarming trend in this sector of cyber crime. Further reading here.