1. Number of mobile phone users worldwide from 2013 to 2019 (in billions);Portal,2018
2. Google announces over 2 billion monthly active devices on android;Popper,2017
3. Some 343 new android malware samples every hour in 2017;Lueg,2018
4. How we fought bad apps and malicious developers in 2017;Ahn,2018
5. Madam: Effective and efficient behavior-based android malware detection and prevention;Saracino;IEEE Trans. Dependable Secure Comput.,2016