Abstract: In one embodiment, a method searches a plurality of application marketplaces for applications where each application marketplace includes a plurality of applications available for download to a mobile device. The method then compares a set of applications in different marketplaces to determine certified instances of applications and uncertified instances of applications. Information is stored for the certified instances of the applications that are found in different marketplaces in a database. The method indexes the information for the certified instances of the applications in the database and stores an index based on the indexing. The index is used to provide a search result for a search query for an application.

Abstract: In one embodiment, a method determines a permission list from an application and generates a set of potential behaviors. The potential behaviors are associated with actions that the application allows when executing on a mobile device where the potential behaviors are determined without execution of the application. The method then determines functional category information regarding a functional category from a set of application marketplaces that contain the application and determines application description information for the application. A required behavior list is generated including a set of required behaviors from the functional category information and the application description information. The method compares the required behaviors to the potential behaviors to determine a set of security related behaviors. The security related behaviors are behaviors found in the potential behaviors, but not in the required behaviors. A security rating is determined based on the set of security related behaviors.

Abstract: Systems and method for receiving mobile device usage data from mobile electronic devices using security applications with enhanced access privileges. The mobile device usage data includes user-specific and application usage data. Application classification databases are searched for application characteristics of applications available for download from multiple marketplaces. Using the application characteristics, a weighted application relationship graph that includes relationship scores for application pairs that describe the degree to which applications in each of the application pairs are related to, is generated. Based on the mobile device usage and the relationship scores, a list of recommended applications can be generated for a particular user. The list of recommended applications includes the applications determined to be associated with at least one of the applications installed on the user's mobile device with a relationship score greater than a threshold.