On 12/11/2020 10.36, Milan Broz wrote:
On 11/11/2020 20:16, Carlos E. R. wrote:On 10/11/2020 17.22, Davide Marchi wrote:Hi to all, I'm wondering how to create a DVD or CDROM encrypted using dm-crypt. I've followed this tutorial, with no luck: http://www.sourcentral.org/luks/iso9660/ and the DVD or cdrom created cannot be activated:Hum. I created encrypted DVD years ago with a similar procedure, somewhat simpler. Basically, I created an empty file of the same size as the CD or DVD, mounted it as a loop device, then I encrypted that loop device, and then I formatted the resulting luks device with any filesystem type I wished, typically XFS. This, so far, still works. Then I just burn that file to DVD. The final step is to mount and decipher the DVD - and this step failed, but it was an XFS error if I remember correctly.You cannot switch block size in XFS - if DVD reports 2k block and XFS was formatted with 4k block device, it will never work.
It worked several years ago, I have dozens of DVDs made this way.
This is not a cryptsetup problem but the way how XFS works. Try to run lsblk -t and compare reported sector size for DVD device and your original device. If it is the same, it should work even for XFS.
-- Cheers / Saludos, Carlos E. R. (from 15.1 x86_64 at Telcontar)
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