I have an external backup hard drive that is encrypted using LUKS. As I was re-organising my backups, I copied the data to another encrypted drive and did a kind of "quick wipe" on the original drive by replacing the key in the key slot with random data. Goal was to use the drive afterwards as a second backup, but at that moment, time failed to properly clean-up the drive and do the second copy.
Unfortunately, meanwhile, my second backup drive and computer were stolen. I'm left with the original backup drive, which theoretically contains the data, but behind a key that I don't know. However, I still know the original key, the one that was previously used in the keyslot, before replacement.
Is there a chance to get back this old keyslot? The drive is a standard magnetic 2.5" USB3 drive, not an SSD. So I don't know if it uses some kind of copy-on-write for such metadata or if some tools could find the data buried underneath the new keyslot?
Internal FS is EXT4 for what is worth.