Kenora_I said:

The encryption key is lost then.
if it was possible to decrypt it then the use of decrypting is useless in the first place

Yep and that's the root cause of the problem.
Samsung uses a 256-bit encryption key...

Kenora_I said:

1. On a PC: Copy (the encrypted and unreadable) contents of the sd card from the phone to your harddrive
2. On the phone: Settings -> Storage -> Sd Card -> Format sd card (this erases all the data on the sd card but don't worry you have a copy on the PC)
3. On the phone: Settings -> Security -> Encrypt sd Card (should be real fast since it's an empty sd card)
4. On the PC: Copy the contents of the sd card onto the phone
5. On the phone: Settings -> Security -> Decrypt sd card (edit: this may take a while depending on how much data was on the card)

The password of your device before encryption should be exact from before.
THIS IS JUST A THEORY hope it works

Click to expand...

Hello
Thank you dear Kenora_I
your solution solved my problem

I don't know how to thank you !
I hope that God will grant you everything you want.

mn96 said:

Hello
Thank you dear Kenora_I
your solution solved my problem

I don't know how to thank you !
I hope that God will grant you everything you want.

The decryption button stays grayed out for me, how did you manage to get it to decrypt???

truetoby said:

Hey guys, I have the same Problem.. also tried the solution suggested by @Kenora_I but it did not work.

But I found a .history file on the encrypted sd card, where information about the time of encryption, the model number of the smartphone and a code (which changed for the encryption after the factory reset, but not after decrypting and encrypting again) were listed.
(+ a number which changed every time of encryption and decryption so I think it´s more like a protocol number or so)

Is the code maybe the password for the encrypted data?
And, as I am not a professional, how is it possible to try to decrypt the data with this key?

I´m afraid that it´s not the only key I need and the other one was gone with the factory reset..
But I have not given up yet and hope you guys can help me somehow..

btw. did I understand it correctly that brutforce doesn´t make sense because the (AES?) encryption technology is so secure?

Click to expand...

The encryption -was- on the user partition which was wiped. I think it's a dead horse, sorry.
Never encrypt data drives... as you are the one most likely to be locked out.

blackhawk said:

The encryption -was- on the user partition which was wiped. I think it's a dead horse, sorry.
Never encrypt data drives... as you are the one most likely to be locked out.

That is awful advice. If your phone gets stolen and your SD card is plain text.. you better hope you didn't have sensitive data in it.. which is insanely difficult to in a phone. Invariably you put some information there you wouldn't want leaked. Of course the side effect is that you can get locked out of your files yourself and have to make provisions for that.

rpgdev said:

That is awful advice. If your phone gets stolen and your SD card is plain text.. you better hope you didn't have sensitive data in it.. which is insanely difficult to in a phone. Invariably you put some information there you wouldn't want leaked. Of course the side effect is that you can get locked out of your files yourself and have to make provisions for that.

Ain't no one stealing my phone...
That "sensitive" data you speak of is absolutely useless once you lose it forever.
You'll learn my wisdom or eventually suffer.

blackhawk said:

Ain't no one stealing my phone...
That "sensitive" data you speak of is absolutely useless once you lose it forever.
You'll learn my wisdom or eventually suffer.

Lol

rpgdev said:

Tired of the almost daily posts here of people locked out of their phone and/or trying to recover encrypted or erased data. A one bit data corruption (SEU) in a critical file is all it takes.
Dropped damage mobo failures are far more common.
99.9% of your data is only special to you.
Even if backed up you will lose some data in a failure or lockout. If your backup data is also encrypted and you lose access for whatever reasons you are boned. A failure by your own design
If you lost all your data, everything, forever, how what that hit you?

blackhawk said:

Ain't no one stealing my phone...
That "sensitive" data you speak of is absolutely useless once you lose it forever.
You'll learn my wisdom or eventually suffer.

Still lol

rpgdev said:

Still lol

Not to the thread's OP
Unencrypted cards mean plug and play to set up/share to a new phone fast.
KISS, keep it simple stupid...

Deleted member 1890170 said:

@mohrestan

Do NOT longer waste your time with trying to recover the encrypted data: As long as don't have the encryption key you can't decrypt them. Point.