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there is no KNOX on my phone . is my data after formatting protected?

Discussion in 'Android Lounge' started by Deleted User, Jan 26, 2022.

  1. Deleted User

    Deleted User Guest
    Thread Starter

    i have a Samsung galaxy M30s android 9 , and before doing a factory reset, i used a password for lock screen and i know that this phone galaxy m30s have no KNOX , so is my data after formate protected and encrypted by FBE (file based encryption) or not ?
     



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  2. mikedt

    mikedt 你好

    Yes it is. Internal storage encryption has been a standard feature since Android 6. Knox was originally intended for enterprises, to keep their Samsung Galaxy devices secure and locked-down,.

    Presumably Samsung didn't intend the M30s for company use, why it doesn't have Knox.
     
    ocnbrze and Deleted User like this.
  3. Hadron

    Hadron Smoke me a kipper...
    VIP Member

    It's an interesting question. Regardless of KNOX encryption has been standard on Android devices since about 5.0. But FBE came in with Android 7, while Full Disk Encrytion was available from 5 to 9. So while I'd expect your device to be encrypted (because storage has been encrypted by default for some time) I can't be sure just from the Android version which type of encryption would have been used. My answer in your other thread was assuming the more modern system (FBE), but I realise I can't be certain.

    However, I suspect my answer still stands: the older Fill-Disk Encryption your password is used in the hashing of the master key, but it's not the full encryption key itself (the device creates a random key on first boot, and I'm pretty certain that is erased by the reset and a new one created). So I don't think you can easily recover your data using it.
     
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  4. Deleted User

    Deleted User Guest
    Thread Starter

    galaxy m30s have no knox cheack for that on google
     
  5. Deleted User

    Deleted User Guest
    Thread Starter

     
  6. Deleted User

    Deleted User Guest
    Thread Starter

    But here Android says encrypted with different keys that can be unlocked independently so it is possible to decrypt again !?
     

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  7. Deleted User

    Deleted User Guest
    Thread Starter

    Is the internal storage encryption related to the lock screen password ??
     
  8. Deleted User

    Deleted User Guest
    Thread Starter

    There is no Knox in this phone galaxy m30s, so I am afraid that the data is not encrypted after doing a factory reset
     

    Attached Files:

  9. Deleted User

    Deleted User Guest
    Thread Starter

    There is no Knox in this phone, so I am afraid that the data is not encrypted after doing a factory reset
     

    Attached Files:

  10. mikedt

    mikedt 你好

    The data is definitely encrypted(to AES256), as it is on all Android device since Android 6. And is NOT recoverable after a factory reset, as the encryption key is deleted during a factory reset.

    Samsung Knox can work with the stock Android storage encryption. Knox is Samsung's feature to make it easier for companies to administer and control their fleet devices, that's it. For example, companies can enforce passwords to unlock their Samsung phones, can provide a remote kill switch, and prevents employees from installing their own whatever apps on company owned devices. That's basically what Knox does.

    FYI about Samsung Knox:
    https://www.samsungknox.com/en
    "A complete suite of enterprise mobility solutions designed to keep your work phones, tablets, and wearables under IT control. So you can focus on your business."


    Apparently Samsung didn't intend the M30s for company fleet use, unlike say their Galaxy S and Note series, that's why it doesn't have Knox.
     
    #10 mikedt, Jan 27, 2022
    Last edited: Jan 27, 2022
    Hadron likes this.
  11. Hadron

    Hadron Smoke me a kipper...
    VIP Member

    Phones initially released with android 4.4 and earlier can revert to an unencrypted state after a reset (though the data that were erased by the reset were encrypted, it's data added after the reset that may not be). A phone initially released with 9 will not.

    KNOX is irrelevant to this:android has encryption independent of Samsung's KNOX add-on.
     
    mikedt likes this.
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