J.O., If all Ubuntu was did was rewrite the luks header information and you have backups of the luks header, you can restore it. As long as it was the original key. -MJ Jacques-Olivier KAPPS wrote: > <quote who="Jonas Meurer"> >> hey, >> >> On 27/08/2009 Jacques-Olivier KAPPS wrote: >>> I have a single encrypted partition which contains my data, /home. I >>> just >>> installed a new system (ubuntu karmic/alternate cd) over my other clear >>> system partitions, and I tried to use the setup program to point my >>> /home >>> directory to my existing and crypted /home partition. Though, it >>> eventually wanted to format it and I canceled the whole operation. >>> >>> Now I can map the device with luksOpen, but the volume itself is >>> unrecognized. >>> >>> I certainly can open the device with luksOpen because I choosed the same >>> password in the installation process, but my guess is that the ubuntu >>> installer erased and replaced the luks headers of my partition by new >>> ones, what do you think? Or maybe is just erased the table partition >>> headers and it can't recognized the filesystem? >> according to your description, you entered a new luks passphrase for the >> encrypted device at ubuntu installation, right? to my knowledge ubuntu >> installation doesn't support management of existing encrypted devices >> yet. for that reason i fear that you reformatted the device (luksFormat) >> during installation process. i hope that you do have backups in that >> case as your data will be lost. >> >> even using the same passphrase doesn't help. the passphrase is only used >> to decrypt the luks masterkey, and that masterkey is generated from >> random data at luksFormat. >> >> please keep in mind that encrypted storage devices don't have backdoors >> implemented. if the masterkey is destroyed/overwritten, the data is >> irrevocably lost by design. >> >> you really should do regular backups of sensitive data, and even more so >> if the data is stored on encrypted devices! >> >> greetings, >> jonas >> > > Thanks for the explanation, > > My bad! I assumed that the ubuntu installer would open the existing > encrypted device, and I didn't think anything was permanently done before > the final "Are you sure you want format those partitions?". > > Luckily I have some backups, but not really up to date. I am going to miss > my summer photo shots! > > regards, > > J.O. > > > > _______________________________________________ > dm-crypt mailing list > dm-crypt@xxxxxxxx > http://www.saout.de/mailman/listinfo/dm-crypt > _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
