[dm-crypt] "No key available with this passphrase."

Mihail Dumitrescu mihai.dumitresq at gmail.com
Fri Dec 27 03:25:58 CET 2013


Hello all,

I saved some important files to an encrypted partition on an external hard
drive. I had it set up, verified that it mounted properly, copied the
files, closed it, verified again, then left the external hard drive sitting
unused on some shelf.
Months later, I cannot unlock it (though I'm only 95% certain that I
remember the password correctly). I have some backups but they're not
complete so I really really want to be able to recover/decrypt it.
I'm reaching out to this mailing list due to this thread that contained
valuable info (
http://www.saout.de/pipermail/dm-crypt/2012-September/002724.html).

Here's what I ran:
$ sudo cryptsetup luksOpen /dev/sdb3 encrypted
No key available with this passphrase.
For all the possible passwords I could think of. The passwords used is in
printable ascii (so there should be no encoding issues). If the passphrase
is wrong, would the same message be shown?

$ sudo cryptsetup luksDump /dev/sdb3
LUKS header information for /dev/sdb3

Version:       1
Cipher name:   aes
Cipher mode:   cbc-essiv:sha256
Hash spec:     sha1
Payload offset: 4096
MK bits:       256
MK digest:     69 af 92 8c 80 1d 21 5e 05 6a ba 47 36 0e 74 a4 15 aa 19 10
MK salt:       18 3e 56 ee bf 34 83 f6 4e e9 1f 81 ec 84 e9 e0
                ed 0a ba 0c 96 c2 a7 de 87 ff c0 3a c2 ca 1e 58
MK iterations: 38500
UUID:           83db3c83-0cef-4c12-895c-0901b608b8dd

Key Slot 0: ENABLED
 Iterations:         154303
Salt:               be af 88 dc 3c 0d 39 98 a2 84 10 c0 ed 05 3f 4b
                       e5 66 a0 bc 0a 95 61 08 d3 d9 72 ff 88 71 a3 4b
 Key material offset: 8
AF stripes:             4000
Key Slot 1: DISABLED
Key Slot 2: DISABLED
Key Slot 3: DISABLED
Key Slot 4: DISABLED
Key Slot 5: DISABLED
Key Slot 6: DISABLED
Key Slot 7: DISABLED
Here, I'm worried about the high number of iterations, 154303.

hd /dev/sdb3 | less
00000000  4c 55 4b 53 ba be 00 01  61 65 73 00 00 00 00 00
 |LUKS....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....|
00000050  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000060  00 00 00 00 00 00 00 00  00 00 10 00 00 00 00 20
 |............... |
00000070  69 af 92 8c 80 1d 21 5e  05 6a ba 47 36 0e 74 a4
 |i.....!^.j.G6.t.|
00000080  15 aa 19 10 18 3e 56 ee  bf 34 83 f6 4e e9 1f 81
 |.....>V..4..N...|
00000090  ec 84 e9 e0 ed 0a ba 0c  96 c2 a7 de 87 ff c0 3a
 |...............:|
000000a0  c2 ca 1e 58 00 00 96 64  38 33 64 62 33 63 38 33
 |...X...d83db3c83|
000000b0  2d 30 63 65 66 2d 34 63  31 32 2d 38 39 35 63 2d
 |-0cef-4c12-895c-|
000000c0  30 39 30 31 62 36 30 38  62 38 64 64 00 00 00 00
 |0901b608b8dd....|
000000d0  00 ac 71 f3 00 02 5a bf  be af 88 dc 3c 0d 39 98
 |..q...Z.....<.9.|
000000e0  a2 84 10 c0 ed 05 3f 4b  e5 66 a0 bc 0a 95 61 08
 |......?K.f....a.|
000000f0  d3 d9 72 ff 88 71 a3 4b  00 00 00 08 00 00 0f a0
 |..r..q.K........|
00000100  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000110  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000120  00 00 00 00 00 00 00 00  00 00 01 08 00 00 0f a0
 |................|
00000130  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000140  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000150  00 00 00 00 00 00 00 00  00 00 02 08 00 00 0f a0
 |................|
00000160  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000170  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000180  00 00 00 00 00 00 00 00  00 00 03 08 00 00 0f a0
 |................|
00000190  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
000001a0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
000001b0  00 00 00 00 00 00 00 00  00 00 04 08 00 00 0f a0
 |................|
000001c0  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
000001d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
000001e0  00 00 00 00 00 00 00 00  00 00 05 08 00 00 0f a0
 |................|
000001f0  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000200  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000210  00 00 00 00 00 00 00 00  00 00 06 08 00 00 0f a0
 |................|
00000220  00 00 de ad 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000230  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
00000240  00 00 00 00 00 00 00 00  00 00 07 08 00 00 0f a0
 |................|
00000250  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
*
00001000  32 77 17 f2 72 6b 6d d8  1e fd de 6c 8a 96 50 e9
 |2w..rkm....l..P.|
00001010  65 19 cc bb 50 6a 4c 38  ff 0b d0 4d 0d c3 bb 3d
 |e...PjL8...M...=|
00001020  15 30 f0 71 fe 79 56 89  93 22 51 ef 0d 1c 5a 92
 |.0.q.yV.."Q...Z.|
00001030  27 0a 63 9a 0e db e4 28  85 45 e3 49 6a 61 66 b4
 |'.c....(.E.Ijaf.|
00001040  dd 36 2a 5d dc 13 e5 30  8c 74 ce 45 6b 8b 8e 83
 |.6*]...0.t.Ek...|
00001050  18 6c 9a 77 ef 51 46 ea  74 ee b9 10 85 68 4d c6
 |.l.w.QF.t....hM.|
00001060  47 01 13 95 1e 29 58 45  3a 08 a2 c6 4c 5d 65 b4
 |G....)XE:...L]e.|

... lots of seemingly random data ...

00020390  50 2b 41 4e 97 6b bc ad  22 6c 7c 1b 76 0a e4 53
 |P+AN.k.."l|.v..S|
000203a0  c9 09 68 1c 76 7a 8e 09  e1 d8 10 a7 4d cc a9 9b
 |..h.vz......M...|
000203b0  f5 81 66 2c bb 5a 03 c5  f2 37 8e 6b 4e d4 07 99
 |..f,.Z...7.kN...|
000203c0  0a c9 19 3c 46 d4 a1 21  5f fe 66 6f 64 54 c2 4a
 |...<F..!_.fodT.J|
000203d0  c3 f3 69 be da 38 c4 d9  5f ad b3 9b b3 37 eb dd
 |..i..8.._....7..|
000203e0  85 37 5d 48 02 08 87 ac  3a 3c 3a 6e 8b f3 03 bb
 |.7]H....:<:n....|
000203f0  16 a0 d7 ae 8a 4b b4 c3  54 42 55 8f d3 21 6a 39
 |.....K..TBU..!j9|
00020400  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
*
00021000  21 80 00 00 21 80 01 00  21 80 02 00 21 80 03 00
 |!...!...!...!...|
00021010  21 80 04 00 21 80 0c 00  21 80 0d 00 21 80 18 00
 |!...!...!...!...|
00021020  21 80 28 00 00 00 00 00  00 00 00 00 00 00 00 00
 |!.(.............|
00021030  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
 |................|
*
00022000  22 80 00 00 22 80 01 00  22 80 02 00 22 80 03 00
 |"..."..."..."...|
00022010  22 80 04 00 22 80 0c 00  22 80 0d 00 22 80 18 00
 |"..."..."..."...|
This looks like the master key seems to be intact, so I guess there's hope?

Thank you,
Mihail Dumitrescu
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