The type of malicious software $($malware$)$ or cyber attack that blocks access to an information system$/$data until the victim accomplishes a specific action is called:$$

The type of malicious software $($malware$)$ or cyber attack that blocks access to an information system$/$data until the victim accomplishes a specific action is called:$$

Phishing e$-$mail

Ransomware

Data breach

Denial of service attack