The existing Android system does not allow customized application permission due to its coarse-grained and inflexible management mechanism. To solve this problem, DroidDefence, a fine-grained Android permission management system was proposed, which was extended on the base of the original Android framework. Users can dynamically allocate application permissions under different scenarios through a light-weight client deployed on mobile device. And safety reports would be released after user data collection and processing based on mobile cloud crowdsourcing. Experimental results showed that DroidDefence can enhance system security and protect user privacy with little system consumption.
