cryptsetup-tcryptDump(8) — Linux manual page



NAME         top

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

SYNOPSIS         top

       cryptsetup tcryptDump [<options>] <device>

DESCRIPTION         top

       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         top

       --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.

       --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.

       --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.

       --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

           See section NOTES ON PASSPHRASE PROCESSING in cryptsetup(8)
           for more information.

       --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.

       --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

           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.

       --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.

       --tcrypt-hidden, --tcrypt-system, --tcrypt-backup
           Specify which TrueCrypt on-disk header will be used to open
           the device. See TCRYPT section in cryptsetup(8) for more

           This option is ignored as VeraCrypt compatible mode is
           supported by default.

           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.

       --veracrypt-pim, --veracrypt-query-pim
           Use a custom Personal Iteration Multiplier (PIM) for
           VeraCrypt device. See TCRYPT section in cryptsetup(8) for
           more info.

       --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.

       --version, -V
           Show the program version.

           Show short option help.

       --help, -?
           Show help text and default parameters.

REPORTING BUGS         top

       Report bugs at cryptsetup mailing list
       <> or in Issues project section

       Please attach output of the failed command with --debug option

SEE ALSO         top

       Cryptsetup FAQ

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

CRYPTSETUP         top

       Part of cryptsetup project
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cryptsetup 2.6.1-git           2022-12-14       CRYPTSETUP-TCRYPTDUMP(8)

Pages that refer to this page: cryptsetup(8)