Phone reports SD card was encrypted by another device - but it wasn't

[appyface]

I hope someone may be able to help me decrypt my external SD card on my Razr Maxx.

After some searching, the closest thing I found that might help me, was this thread. But it's unclear to me whether the OP was ever successful at retrieving the contents of her SD card:
SD card encrypted, cannot retrieve

I have been using my Razr Maxx with encryption from the beginning (I bought this phone on 2/29/12 - lucky day? hmmm). Droid version 2.3.6.

Four times now the phone is not able to read files on the external SD card. In all cases the phone created these files, they are pictures and videos. The phone also successfully displayed/played them back several times, before being unable to read them.

In the first three cases, there were just a few pictures/videos on the card and none were important. So I just formatted the card and moved on. And all worked as expected until the next time...

The fourth incident happened yesterday. The pictures and videos on the card I took while on a trip four days ago. I've viewed and played them back successfully several times up until yesterday. I can stand to lose these files if I have to, but I'd really like to recover them if I can.

I tried rebooting the phone but that didn't change anything. So I dismounted the SD card, then removed it, booted the phone. When I re-insert the SD card, I get these popup messages:

SD Card Password Protection
SD card has been secured by another device and cannot be accessed unless formatted

After acknowledging that popup, then comes this popup:

SD Card Password Protection
Failed to verify SD card security settings. Encrypted content is not accessible.

Acknowledge that popup, and that's that. And the SD card is not mounted.

I sure wish I knew what was causing this, so I could prevent it... Wait for ICS maybe?

Thank you in advance for any help with retrieving the contents and/or preventing this in the future.

Kind regards,
--appyface

[appyface]

I gave up and formatted the card this morning. But I'd sure like to find out what is causing this problem.

I'd also like to find out if there are any utilities I can use to decrypt the card from my PC, should this happen again? I encrypted my phone using the "password only" option, as I hoped that meant it could be decrypted externally by supplying the password. But as yet I haven't found a utility that can do this -- does anybody know of some?

[TisMyDroid]

Wow, that is ridiculous. Sorry you also had to go through this. Too late now but my shot in the dark was to suggest removing the sim card and placing it back in again. We have found out that decryption can only happen in the phone that it was encrypted in. The sim card idea was only because maybe it is also tied to the sim identity. We also know that if the phone is reformatted, the ability to decrypt is lost. FoxKat has worked many hours and has been working diligently on solving this issue. Two things of best advice for now is to not encrypt until these quirks are figured out or if you do need to encrypt, save backups of your files frequently.

Sent from my DROID RAZR Maxx using Droid Forums

[appyface]

Thanks -- but that's exactly what I did (see my opening post) and then the card could not be mounted at all.

Before giving up, I also tried restoring the SD card from the backup by MotoUSB (from what I can tell it just copies the files into compressed CABs but doesn't decrypt anything). After restore the phone still could not read those files.

I chose "password-only" encryption when I set up my phone, knowing that is "less strong" but also thinking the SD card can be decrypted without needing any device info -- whether from mounting to my PC or from within the same or different phone (that supports AES 256 of course). Seems to be a wrong assumption all the way 'round.

I've posted in the Motorola forums but I see no one there has fared any better (mostly same players as here). I hope Motorola will add a decrypt option to the MotoUSB backup. I can write my backup into a TrueCrypt container so having it written out decrypted first would be very helpful.

I'm very good about making backups (even if they turn out to be of no use ) -- but we are all still SOL for recovering any new files since the backup of course! Especially if the phone dies and there is no chance to back up the files.

I realize the argument is that encryption is meant to keep theives out. It's the very same reason I lock my house. But I also expect to get back in, if I have my key...

[TisMyDroid]

Unbelievably absurd. So what you are saying is that even though you back the files to your pc, you still can't access them, can't read them? Are the files decrypted before being transferred? If that is not possible to back up a readable file then it makes the feature absolutely useless. The encrypted files are only as good as your phone. Crazy!

Keep your eye on the other thread because foxkat is working on this. I am sure he will see your situation here and work on trouble shooting it as well... even though not helpful for you now but for future reference for anyone who wants to encrypt.

Sent from my DROID RAZR Maxx using Droid Forums

[appyface]

As I wrote above, the files are NOT decrypted by the backup software as far as I can tell. My PC can unpack the backup CAB files into individual files -- but the contents of those files are scrambled (I assumed, by encryption!). I tried copying those unpacked files straight over to the SD card but the phone can't read them.

And as I wrote above, using MotoUSB restore to phone didn't work either. I assume there must still be some kind of device dependency, even though I chose "password-only" encryption, that isn't part of the MotoUSB backup.

[TisMyDroid]

Yes, that is what foxkat has found out, that so far to decrypt the files it is phone dependent. And I believe you have to decrypt the file on your phone then back up the decrypted file to your pc in order to open them on your pc.

You are so right...moto royally failed on this one. You would think that all you should need, no matter where the files are stored, is the password if you choose password only. We have all been baffled by motor's thinking (or lack of thinking) on this.

Sent from my DROID RAZR Maxx using Droid Forums

[appyface]

There is no straightforward way to decrypt before backing up either, as far as I can tell. (Except maybe to buy a 3rd party app with lukewarm reviews... )

To decrypt for a backup, I think the only thing I can do is:
1. Turn off encryption
2. Use the phone to copy encrypted files to another location - now they will be written decrypted
3. Back up the phone
4. Delete the decrypted files
5. Turn on encryption

PITA even for just one file, let alone a 32G SD card's worth of directories and files. And I don't have enough room to decrypt them all and back them up, so would have to do it piecemeal...

And again this crazy procedure idea relies on the phone being able to read the files in the first place. My phone stopped being able to read the files. True it was several days later and I had already backed up, but what if it happened while I was still on my trip, before I had an opportunity to back them up? Or what if the phone died? The contents of the SD card are apparently lost forever if the phone can't read them...

Yes I'd say moto failed us on many fronts...

[FoxKat]

There is no straightforward way to decrypt before backing up either, as far as I can tell. (Except maybe to buy a 3rd party app with lukewarm reviews... )

To decrypt for a backup, I think the only thing I can do is:
1. Turn off encryption
2. Use the phone to copy encrypted files to another location - now they will be written decrypted
3. Back up the phone
4. Delete the decrypted files
5. Turn on encryption

PITA even for just one file, let alone a 32G SD card's worth of directories and files. And I don't have enough room to decrypt them all and back them up, so would have to do it piecemeal...

And again this crazy procedure idea relies on the phone being able to read the files in the first place. My phone stopped being able to read the files. True it was several days later and I had already backed up, but what if it happened while I was still on my trip, before I had an opportunity to back them up? Or what if the phone died? The contents of the SD card are apparently lost forever if the phone can't read them...

Yes I'd say moto failed us on many fronts...

Not an answer to you're issue since we are all working hard to find one, but if you install Motocast on the home PC and set the phone to sync all files and pics, at last those taken while encryption is enabled will be preserved. Also Dropbox is a valuable tool to back up those files to a cloud, although Box is even better since it gives you 50GB free! I actually have all three running for triple redundancy and I am not even using encryption.

Sent from my DROID RAZR using Xparent ICS Tapatalk 2

[appyface]

and I am not even using encryption.

If you were using encryption you'd be in the same boat as me, FoxKat...

I *am* backing up via MotoUSB (it uses MotoCast). Doesn't matter if I use MotoUSB (using MotoCast) to restore the files, or if I unpack them from the backup CABs manually and copy the individual files to the card. Phone can't read the files either way...