man 8 CRYPTSETUP-TCRYPTDUMP

CRYPTSETUP-TCRYPTDUMP(8)     Maintenance Commands     CRYPTSETUP-TCRYPTDUMP(8)

NAME
       cryptsetup-tcryptDump - dump the header information of a TCRYPT
       (TrueCrypt or VeraCrypt compatible) device

SYNOPSIS
       cryptsetup tcryptDump [<options>] <device> 

DESCRIPTION
       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.

OPTIONS
       --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.

REPORTING BUGS
       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.

SEE ALSO
       Cryptsetup FAQ
       <https://gitlab.com/cryptsetup/cryptsetup/wikis/FrequentlyAskedQuestions> 

       cryptsetup(8), integritysetup(8) and veritysetup(8)

CRYPTSETUP
       Part of cryptsetup project <https://gitlab.com/cryptsetup/cryptsetup/>.

cryptsetup 2.7.2                  2025-06-13          CRYPTSETUP-TCRYPTDUMP(8)