[dm-crypt] How to recognize a LUKS container

Ralf Ramsauer ralf+dm at ramses-pyramidenbau.de
Tue Sep 22 22:03:48 CEST 2015


Hello,

there are few options how to detect a LUKS container:

- use 'cryptsetup luksDump' on your device. It will fail, if it's not a
LUKS container.
- If you have a dump, you can also use the 'file' command

Or the sophisticated one :-)
- Look at the first few bytes of your partition/dump and check, if it
contains the magic header "LUKS"
  'sudo head -c 128 /dev/yourdevice | hexdump -C'
It should look like

    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  78 74 73 2d 70 6c 61 69 
    |........xts-plai|
    00000030  6e 36 34 00 00 00 00 00  00 00 00 00 00 00 00 00 
    |n64.............|
    ...


Cheers
  Ralf

On 09/22/2015 08:52 PM, H McCurdy wrote:
> Hi,
>
> I've read the FAQ (but can't guarantee I didn't miss something).  In
> the warnings sections about the Ubuntu installer I read "... (it is
> very easy to recognize a LUKS container)..."
>
> I don't actually need to know, but I'd like to know how this is done. 
> I didn't find the answer in the FAQ, didn't find it using Google and
> didn't find it on Stack Overflow.
>
>
>
> _______________________________________________
> dm-crypt mailing list
> dm-crypt at saout.de
> http://www.saout.de/mailman/listinfo/dm-crypt

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