Secured application package files for mobile computing devices

摘要

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.

主权项

1. A computer-implemented method comprising:
receiving a secured application package file in a mobile computing device, the secured application package file comprising an encrypted Dalvik executable (DEX) file, a second DEX file, and a decryptor class loader; executing the second DEX file to start a wrapper Activity that replaces a class loader of Activity of an ANDROID operating system Dalvik virtual machine of the mobile computing device with the decryptor class loader and loads the decryptor class loader; using the decryptor class loader to decrypt the encrypted DEX file to recover a first DEX file; using the decryptor class loader, instead of the class loader of Activity of the Dalvik virtual machine of the mobile computing device, to load classes of the first DEX file into the Dalvik virtual machine of the mobile operating system; and using the wrapper Activity to start an Activity that uses classes from the first DEX file.