How did the attacks work for both operating systems, and what defenses to use in order to mitigate against the attacks.

Mobile Ransomware (Mobile Device Security / Cyber Security)

Write a research paper referencing 5 scholarly journals on current ransomware threats affecting mobile devices. This should include the current state of events for android and iPhone devices, how did the attacks work for both operating systems, and what defenses to use in order to mitigate against the attacks.