Ransomware is one of the nastier types of malicious software to emerge in the last few years. It's not exclusive to mobile, but the basic gist is that it locks down either specific files or an entire machine until the user sends money to a shady, untraceable online account to get their digital life back in order. The combination of easily-exploited security vulnerabilities, relatively small payments spread out over thousands of devices, and users reliance on their phones or computers has proven incredibly lucrative for malware developers.
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