Trend Micro Inc.

Yinfeng Qiu

Shuhua Chen

Zhentao Huang

Gen Chen

Yaozhou Xu

Jinzhi Guo

A virtual mobile infrastructure includes a mobile client device running a local mobile operating system and a server computer running a remote mobile operating system. The mobile client device displays a screen image of the remote mobile operating system. User text inputs for a remote application running on the remote mobile operating system are received by way of a touchscreen keyboard of a local input method editor (IME) of the local mobile operating system. The user text inputs are transmitted from the mobile client device to the server computer, where the text inputs are provided to the remote application by a virtual IME of the remote mobile operating system.

Systems and methods for providing user inputs to remote mobile operating systems

An ANDROID application package (APK) file for an application is repackaged into a secured APK file to protect a Dalvik executable (DEX) file of the application. The DEX file is encrypted to generate an encrypted DEX file that is included in the secured APK file along with a stub DEX file. The secured APK file is received in a mobile computing device where the stub DEX file is started to start a wrapper Activity. The wrapper Activity replaces an APK class loader of a mobile operating system of the mobile computing device with a decryptor class loader. The decryptor class loader decrypts the encrypted DEX file to recover the DEX file, and loads classes of the DEX file into a Dalvik virtual machine. The original Activity of the application is then started to provide the functionality of the application in the mobile computing device.

Secured application package files for mobile computing devices

The behavior of an installed application within the Android device is modified. The program code is modified to allow a security application to load and run the application within its own context. The modified program code is repacked into a modified APK file, executed within the context of the security application. A component within a target application includes APIs for starting other components. These APIs are modified to use a new intent object which points to a proxy component. A modified target application is executed. The security application loads the target application into memory without installing it. The security application includes a component of each type and creates a proxy component instance for each component in the target application. A proxy component under control of the security application is created for each component within the target application. The target application is executed under the control of the security application.

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Nanjing, China

Yinfeng Qiu