Possible Double Encryption?

Crock

Hello, I use Boxcryptor (win10) with Dropbox and am having problems with 1 folder. It seems that all the files are unable to be opened. I would say that they are corrupted, but it seems odd that it is only with one of my folders.
When I open one of the files (any of these files) via BC using Notepad, I see what appears to be the BC header information (See below). It appears to be what I'd see in a xxx.bc file.
I had that foder synced 'locally' with dropbox on an old development laptop, so I'm questioning whether it's possible that these somehow were encrypted twice? Is that possible, and what process would I go through to decrypt them?

Thanks.
CH

Here's an example of the header data I see in an excel file "BOOK2.xlsx" when I open it in notepad.
bc01! ¯ ’l¶Tš¥€ †€(‚H[•ñ;þ:ÉwYƒ©EŒY¯{"artifact":"header","cipher":{"algorithm":"AES","IvBytes":"8/sAk5WvdAzNcp1Aw1t+lw==","mac":{"enabled":false},"mode":"CBC","padding":"PKCS7","keySize":256,"blockSize":4096,"iv":"8/sAk5WvdAzNcp1Aw1t+lw=="},"metadata":{"name":{"encrypted":false,"value":"Book2.xlsx.bc"}},"version":1,"encryptedFileKeys":[{"type":"data","id":"2309120856747115994","value":"PLU9AL1bt7+RLIR1IeoDicrbRG6tBV2LoNRxrwQP3SLfjjhy1OyAfXQxtgpx0O8/hOJUYWkSFuBk4uXJhxqzlQtNAiX1aA6HX96ey4a35/fxcT+lLMfc8cIvlXAJitDk93-----------------ripmStNhb7HG92bEK4WiO/xyV4Pv4qms4JjFjHo+b4o4DsAJ+6IcnLJAiKQkUzKGgzLKhzM9u8Uc+v-----------------yWzdGHmO5DEKOTf91dNZmY3s49BNPenInIGWBnBRJoJhRJhxbZAKnIzn6GwriSLRbGibFEEn-------------------------ZRKg=","Unlocked":true}]}

ED: Ignore the "------------------" characters as I didn't want to potentially post any keys.

Florian

Hi Crock, thanks for the report.

Usually Boxcryptor prevents you from decrypting files twice (if you drop a .bc file into the Boxcryptor drive, you will receive an error).

Can you track the "history" of the files how they could possibly became encrypted twice? Maybe the Dropbox history shows something interesting.

Crock Is that possible, and what process would I go through to decrypt them?

Copy the files from the Boxcryptor drive to a "physical" folder in Dropbox (e.g. X:\Dropbox\my\double\encrypted\files\ -> C:\Users\<USERNAME>\Dropbox\fix double encryption\),
then navigate to the folder in Boxcryptor (e.g. X:\Dropbox\fix double encryption\) and see if you can open the files again.

Best regards,
Florian

Crock

To Clarify:
The file contents above are from the Book2.xlsx file AFTER I removed it from the BC drive - i.e. it had been decrypted, but still seemed to show the BC header info. That is what is leading me to beleive it may have been encrypted twice.