On Thu, Jan 06, 2011 at 10:08:42PM +0100, Jonas Meurer wrote: > Hey, > > On 06/01/2011 Arno Wagner wrote: > > On Thu, Jan 06, 2011 at 04:33:52PM +0100, Jan Christoph Uhde wrote: > > > > Is this plain dm-crypt? > > > > > > i used cryptsetup in debian sid > > > > Yes, but did you create a LUKS partition or a plain dm-crypt one? > > The default would have been dm-crypt. Hmm. That would mean the cipher > > is probably the old default of aes-cbc-plain. Can anybody confirm that > > for Debian SID? > > what do you mean with "the default". it highly depends on the method > that was used to encrpyt the device. was it done during installation > process (debian-installer), with the shipped luksformat script, with > some graphical frontend (gnome-device-manager, gnome-disk-utility, ...) > or by invoking cryptsetup directly (with which commandline arguments?). > > the default cipher depends on the cryptsetup package version used when > the decive was encrypted. That is why I asked. And you are right, a commandline default does not cut it, more information is needed. Well, at least whether it was LUKS or not is easily answered. A look into a hexdump of the start of the device will show the magic string "LUKS" right at the start. Options to get that: - hd /dev/<device> | head - hexdump /dev/<device> | head - hex /dev/<device> | head and possibly a few others. Example from my LUKS test container in a file: R gatewagner:~/f/luks# hd luksfile | head 00000000 4c 55 4b 53 ba be 00 01 61 65 73 00 00 00 00 00 |LUKSº¾..aes.....| 00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| 00000020 00 00 00 00 00 00 00 00 63 62 63 2d 65 73 73 69 |........cbc-essi| 00000030 76 3a 73 68 61 32 35 36 00 00 00 00 00 00 00 00 |v:sha256........| 00000040 00 00 00 00 00 00 00 00 73 68 61 31 00 00 00 00 |........sha1....| If it looks completely random though, it is likely plain dm-crypt. Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., CISSP -- Email: arno@xxxxxxxxxxx GnuPG: ID: 1E25338F FP: 0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F ---- Cuddly UI's are the manifestation of wishful thinking. -- Dylan Evans If it's in the news, don't worry about it. The very definition of "news" is "something that hardly ever happens." -- Bruce Schneier
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