Mobile OS and Application Security Issues

Question 1

Security concerns

Answer 1

Android package (APK) source.
Developer mode.
Root access/jailbreak.
Bootleg/malicious application: Application spoofing.

Question 2

Common symptoms of issues

Answer 2

High network traffic.
Sluggish response time.
Data-usage limit notification.
Limited internet connectivity.
No internet connectivity.
High number of ads.
Fake security warnings.
Unexpected application behavior.
Leaked personal files or data.