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.
Answer
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
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