Ransomware is malicious software that encrypts a victim's files or locks the system and then demands payment-usually in cryptocurrency-in exchange for the decryption key or restored access. Other listed options describe different malware types: displaying ads is characteristic of adware, recording keystrokes fits a keylogger, and covertly using system resources to generate cryptocurrency points to a cryptominer.
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How does ransomware encrypt files on a victim's system?
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Why is cryptocurrency commonly used as ransom payment in ransomware attacks?
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What steps can users take to protect their systems against ransomware?