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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | REPORTING BUGS | SEE ALSO | CRYPTSETUP |
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CRYPTSETUP-BITLKDUMP(8) Maintenance Commands CRYPTSETUP-BITLKDUMP(8)
cryptsetup-bitlkDump - dump the header information of a BITLK
(BitLocker compatible) device
cryptsetup bitlkDump [<options>] <device>
Dump the header information of a BITLK (BitLocker compatible)
device.
If the --dump-volume-key option is used, the BITLK device volume
key is dumped instead of header information. You have to provide a
password or keyfile to dump the volume key.
Beware that the volume key can be used to decrypt the data stored
in the container without a passphrase. This means that if the
volume key is compromised, the whole device has to be erased to
prevent further access. Use this option carefully.
<options> can be [--dump-volume-key, --volume-key-file,
--key-file, --keyfile-offset, --keyfile-size, --timeout].
--batch-mode, -q
Suppresses all confirmation questions. Use with care!
If the --verify-passphrase option is not specified, this
option also switches off the passphrase verification.
--debug or --debug-json
Run in debug mode with full diagnostic logs. Debug output
lines are always prefixed by #.
If --debug-json is used, additional LUKS2 JSON data structures
are printed.
--dump-volume-key, --dump-master-key (OBSOLETE alias)
Print the volume key in the displayed information. Use with
care, as the volume key can be used to bypass the passphrases,
see also option --volume-key-file.
--help, -?
Show help text and default parameters.
--key-file, -d file
Read the passphrase from the file.
If the name given is "-", then the passphrase will be read
from stdin. In this case, reading will not stop at newline
characters.
See section NOTES ON PASSPHRASE PROCESSING in cryptsetup(8)
for more information.
--keyfile-offset value
Skip value bytes at the beginning of the key file.
--keyfile-size, -l value
Read a maximum of value bytes from the key file. The default
is to read the whole file up to the compiled-in maximum that
can be queried with --help. Supplying more data than the
compiled-in maximum aborts the operation.
This option is useful to cut trailing newlines, for example.
If --keyfile-offset is also given, the size count starts after
the offset.
--timeout, -t seconds
The number of seconds to wait before a timeout on passphrase
input via terminal. It is relevant every time a passphrase is
asked. It has no effect if used in conjunction with
--key-file.
This option is useful when the system should not stall if the
user does not input a passphrase, e.g., during boot. The
default is a value of 0 seconds, which means to wait forever.
--usage
Show short option help.
--version, -V
Show the program version.
--volume-key-file file, --master-key-file file (OBSOLETE alias)
Use a volume key stored in a file.
The volume key is stored in a file instead of being printed
out to standard output.
Report bugs at cryptsetup mailing list
<cryptsetup@lists.linux.dev> or in Issues project section
<https://gitlab.com/cryptsetup/cryptsetup/-/issues/new>.
Please attach the output of the failed command with --debug option
added.
Cryptsetup FAQ
<https://gitlab.com/cryptsetup/cryptsetup/wikis/FrequentlyAskedQuestions>
cryptsetup(8), integritysetup(8) and veritysetup(8)
Part of cryptsetup project
<https://gitlab.com/cryptsetup/cryptsetup/>. This page is part of
the Cryptsetup ((open-source disk encryption)) project.
Information about the project can be found at
⟨https://gitlab.com/cryptsetup/cryptsetup⟩. If you have a bug
report for this manual page, send it to dm-crypt@saout.de. This
page was obtained from the project's upstream Git repository
⟨https://gitlab.com/cryptsetup/cryptsetup.git⟩ on 2025-08-11. (At
that time, the date of the most recent commit that was found in
the repository was 2025-08-01.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
cryptsetup 2.8.1-git 2025-08-09 CRYPTSETUP-BITLKDUMP(8)
Pages that refer to this page: cryptsetup(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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