Thank you for your kind help. I have tried the following:
* manually unlock the partition with a Fedora 15 live (it has cryptsetup 1.3), and with an Ubuntu 11.04 live (which has 1.1 without the updates installed on my system). No luck, cryptsetup returns "no available key".
* looked at the hex data of the keyslot (between 0x01000 and 0x20400) : no obvious patterns
As for a possible problem with seahorse: I use the same password on both hard drives, seahorse shows them correctly, i can manually unlock the other hard drive with the password and with seahorse... so I don't think that the problem lies here.
Unfortunately i had not backed up the header nor retrieved the master key. It's ok though, this hard drive only contains backups and unimportant stuff. I'll just format the partition if I don't find a solution. And then backup the header and the master key :D
What worries me is that I have no clue what happened. A damage to the header is it possible without any signs of it ?
Ric.
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