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Are there any off-the-shelf options for securing the contents of an SD card so that files written by apps writing to SD are encrypted? If so, what is the best option?

I'm looking for something for all apps. I would strongly prefer to do it without rooting.

Matthew Read
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BrianCooksey
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3 Answers3

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For anyone who stumbles upon this topic. Motorola seems to offer a solution for full storage encryption of internal and sd card.

Link: https://motorola-enterprise.custhelp.com/app/answers/detail/a_id/57094

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Android 6.0 (Marshmallow) has a feature called "adoptable storage", which allows the external SD card to be treated as if it were internal storage. When this is done, everything on the card is encrypted.

More details: https://source.android.com/devices/storage/adoptable.html

Matthew Read
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As of July 2014, I've found the following options for SD card encryption:

  • Boxcryptor - not open source; developed by German company; supports sync with cloud storage; unclear if they've received a backdoor request
  • cryptonite - open source; supports mounting TrueCrypt volumes; no backdoor request yet
Dan Dascalescu
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