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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | REPORTING BUGS | SEE ALSO | CRYPTSETUP |
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CRYPTSETUP-TCRYPTDUMP(8) Maintenance Commands CRYPTSETUP-TCRYPTDUMP(8)
cryptsetup-tcryptDump - dump the header information of a TCRYPT
(TrueCrypt or VeraCrypt compatible) device
cryptsetup tcryptDump [<options>] <device>
Dump the header information of a TCRYPT (TrueCrypt or VeraCrypt
compatible) device.
If the --dump-volume-key option is used, the TCRYPT device volume
key is dumped instead of TCRYPT header info. Beware that the
volume key (or concatenated volume keys if cipher chain is used)
can be used to decrypt the data stored in the TCRYPT 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, --key-file, --tcrypt-hidden,
--tcrypt-system, --tcrypt-backup, --veracrypt (ignored),
--disable-veracrypt, --veracrypt-pim, --veracrypt-query-pim,
--cipher, --hash, --header, --verify-passphrase, --timeout].
The keyfile parameter allows a combination of file content with
the passphrase and can be repeated.
--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.
--cipher, -c <cipher-spec>
Set the cipher specification string for plain device type.
For tcrypt device type it restricts checked cipher chains
when looking for header.
--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.
--disable-veracrypt
This option can be used to disable VeraCrypt compatible mode
(only TrueCrypt devices are recognized). Only for TCRYPT
extension. See TCRYPT section in cryptsetup(8) for more info.
--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.
--hash, -h <hash-spec>
Specifies the passphrase hash. Applies to plain and loopaes
device types only.
For tcrypt device type, it restricts checked PBKDF2 variants
when looking for header.
--header <device or file storing the LUKS header>
Use a detached (separated) metadata device or file where the
LUKS header is stored. This option allows one to store
ciphertext and LUKS header on different devices.
For commands that change the LUKS header (e.g. luksAddKey),
specify the device or file with the LUKS header directly as
the LUKS device.
--help, -?
Show help text and default parameters.
--key-file, -d name
Read the passphrase from 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.
--tcrypt-backup, --tcrypt-hidden, --tcrypt-system
Specify which TrueCrypt on-disk header will be used to open
the device. See TCRYPT section in cryptsetup(8) for more
info.
--timeout, -t <number of seconds>
The number of seconds to wait before 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.
--veracrypt
This option is ignored as VeraCrypt compatible mode is
supported by default.
--veracrypt-pim, --veracrypt-query-pim
Use a custom Personal Iteration Multiplier (PIM) for
VeraCrypt device. See TCRYPT section in cryptsetup(8) for
more info.
--verify-passphrase, -y
When interactively asking for a passphrase, ask for it twice
and complain if both inputs do not match. Ignored on input
from file or stdin.
--version, -V
Show the program version.
Report bugs at cryptsetup mailing list
<cryptsetup@lists.linux.dev> or in Issues project section
<https://gitlab.com/cryptsetup/cryptsetup/-/issues/new>.
Please attach 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 2024-06-14. (At
that time, the date of the most recent commit that was found in
the repository was 2024-06-11.) 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 2.8.0-git 2023-09-13 CRYPTSETUP-TCRYPTDUMP(8)
Pages that refer to this page: cryptsetup(8)
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HTML rendering created 2024-06-26 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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