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I backed up encrypted data of adopted internal storage on my PC & then Formatted the SD card as portable storage.

But I have not factory reset my android system so the key for decryption must be inside the Android system internal storage.

Now I have the encrypted data stored on PC & key inside my Android system storage. If I manage to extract the Key to decrypt the data stored on PC. Then How to use that key to decrypt the data? And where to do the decryption? On Android or on PC?? And how to do it?

alecxs
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Abhishek Rawat
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    Does this answer your question? How to decrypt Adopted Storage? – Robert Jul 21 '22 at 12:39
  • please give sample of "encrypted data stored on PC" so we can double check the linked answer applies or is maybe outdated for android 12 – alecxs Jul 22 '22 at 17:50
  • Almost all of the backed up data is .jpg files i.e. Images & some of it are Videos (30gb of media out of total 31Gb). Solution linked seems outdated atleast to me on reading it. I am currently on Android 12 with Root access to the device. Can someone help me out here on how to make the backed up data Readable again??? – Abhishek Rawat Jul 23 '22 at 14:51
  • according to documentation if the device is configured to use file-based encryption (FBE) on its internal storage, then adoptable storage uses both FBE and metadata encryption. if you can see plain file names, this leads to conclusion files are not encrypted at all (metadata encryption does not show file names). more likely you faced MTP bug and files are corrupt – alecxs Jul 25 '22 at 18:13
  • This went over the top of my head. Can u explain it in layman's terms? Can the decryption Key present inside the Android system internal storage be used to make the backed up data usable again? Can the Key make the data Readable again? If so, how to use that Key to Read the data or Decrypt the data and Make it usable again? – Abhishek Rawat Jul 27 '22 at 04:13
  • I said, your files are not encrypted but simply corrupted. yes it's possible to decrypt on PC. but I don't know how to do that for FBE. consult expert for android 12 – alecxs Jul 27 '22 at 07:14
  • Is it possible to plug your Android device into your PC and navigate to the files via your Android device and decrypt the files that way? – Archerbob Aug 04 '22 at 13:59
  • Try this to retrieve the files: https://forum.xda-developers.com/t/mate-9-how-to-retrieve-encrypted-files-from-a-broken-system-userdata-partition.3894561/ – Lavyansi Sep 06 '22 at 08:40
  • @Lavyansi do you know files are encrypted same way as file on data? guess the key is only for metadata decryption then https://github.com/LineageOS/android_system_vold/blob/lineage-20.0/FsCrypt.cpp#L276 – alecxs Jan 30 '23 at 11:24

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