**4. Mobile operating systems: android and Apple iOS**

#### **4.1 Android**

The Android operating system is a platform developed by the Google group designed for mobile structure, being a free system allows many programmers to produce viruses for various attacks. Faced with this problem makes it vulnerable. "In the case of Android, the kernel was designed based on version 2.6 of the Linux kernel having similarity in its functionalities, such as security, memory management, process management, etc." (Silva, cited by Leite e Reis [8]). Android is an operating system that has become very popular due to the number of phones sold, causing greater vulnerability regarding its handling if there is no information security culture and carelessness has taken over many users, in addition to other technological security procedures that should be strengthened in the development of iOS systems. According to Munhoz, quoted by Quissanga [1], "A new virus for Android has now emerged and can be doom for many people, because the malicious 'software' automatically performs 'downloads', including of paid 'apps' and games." However, it is possible to have an overview of the risks that there are mobile operating systems, so it is more talked about viruses on computers, in this case, we see the relevance of its study by creating security policies to avoid virtual plagues.
