How to decrypt GMX or web.de Tresor

[martinhomann]

Hello all,

I just wanted to share something that maybe helps others. Recently, GMX announced that they stop supporting GMX Tresor. There was no real time to prepare, so I could not access my files anymore. I tried a few things and found a way that works for me. Maybe it works for you too, so I decided to share it:

Step 1: Change Cyberduck Configuration

The GMX Tresor is using Cryptomator technology, but the file format is a bit different. So I had to change some settings in Cyberduck to make it work. I saw that there are a few ways to do this, but I just created a configuration file because that was easiest for me. Here is what I did:

• On macOS: I created the file ~/Library/Group Containers/G69SCX94XU.duck/Library/Application Support/duck/default.properties
• On Windows, I believe it must go into this path (haven't tried it) %AppData%\Cyberduck\default.properties

Then I opened the file in a normal text editor and wrote this inside:

For GMX

cryptomator.vault.masterkey.filename=systemdaten.gmxtresor
cryptomator.vault.pepper=gmx

For web.de

cryptomator.vault.masterkey.filename=systemdaten.webdetresor
cryptomator.vault.pepper=web.de

Step 2: Restart Cyberduck and Open the Tresor

I already had downloaded my GMX Tresor to my computer. In Cyberduck, I created a new connection, and at the top I chose my computer as the connection type. That part is explained in their documentation here.

After that, I found my Tresor folder, clicked it, and entered the password. Then it opened and I could see all my data again. 🙂

Hope this helps someone. Let me know if you had the same issue or found another way.

[dickesd]

Any chance you could post your file structure of the tresor? I am trying to decrypt my web.de tresor, but won't get it to work

[dickesd]

I am trying to decrypt my web.de Tresor, but it won't work like described above. it's not accepting my passkey in cyberduck. ai told me, that i am mssing two folders..

[martinhomann]

I don't have my old file structure any longer, but it was basically the d folder with all its contents and of course the systemdaten.gmxtresor file. Presumably the latter will be systemdaten.webdetresor in your case.

So this is what you need:

.
├─ systemdaten.webdetresor
├─ d
│  └─ ...

[martinhomann]

Oh and you will probably need to change the values in the configuration file to:

cryptomator.vault.masterkey.filename=systemdaten.webdetresor
cryptomator.vault.pepper=webde

(just guessing, since I don't have web.de - maybe someone can confirm this)

[ylangisc]

The settings are

cryptomator.vault.masterkey.filename=systemdaten.webdetresor
cryptomator.vault.pepper=web.de

[dickesd]

It worked! Thanks so much, guys!