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I am searching on how to implement Expansion Files in android because of my apk size. Now problem is that Expension files stored on device storage so is that possible that after downloading expansion files on request anyone can copy these or transfer these files through usb and use these expansion files

User42590
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  • The right solution depends, of course, on the nature of the data in your expansion file and on the kind of app. But you can always decrypt these data, no? – class stacker Feb 04 '13 at 07:41

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There's a JOBB tool for encapsulation and encryption http://developer.android.com/tools/help/jobb.html

Alex Florescu
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  • yah i search on it but i want know that these obb files stored on device storage so is that possible these files can be copied after decryption??? i am asking about the security of these files – User42590 Feb 04 '13 at 07:59
  • I'm sure that if someone really wanted to do it, they could, but I don't think it's trivial (i.e. I don't imagine that you can just find an unencrypted copy of the expansion file sitting somewhere where the user can grab it and copy it), as that would defeat the purpose. This is not for encrypting in transmission, it's for having it be encrypted on the device. – Alex Florescu Feb 04 '13 at 08:10