# cryptsetup-tcryptDump

## 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 the TCRYPT header info. Beware that the
           volume key (or concatenated volume keys if a 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.
    
           The --key-file option allows a combination of file content with
           the passphrase The --key-file option can be repeated. Note that
           using keyfiles differs from LUKS keyfile logic.
    
           **< 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].
    


## 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 the _plain_ device type.
    
               For the _tcrypt_ device type, it restricts checked cipher chains
               when looking for the 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). See the _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 the _tcrypt_ device type, it restricts the checked PBKDF2
               variants when looking for the 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 the
               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** _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.
    
           **--tcrypt-backup** , **--tcrypt-hidden** , **--tcrypt-system**
               Specify which TrueCrypt on-disk header will be used to open
               the device. See the _TCRYPT_ section in cryptsetup(8) for more
               info.
    
               Using a system-encrypted device with the --tcrypt-system
               option requires specific settings to work as expected.
    
               TrueCrypt/VeraCrypt supports full system encryption (only a
               partition table is not encrypted) or system partition
               encryption (only a system partition is encrypted). The
               metadata header then contains the offset and size of the
               encrypted area. Cryptsetup needs to know the specific
               partition offset to calculate encryption parameters. To
               properly map a partition, you must specify a real partition
               device so cryptsetup can calculate this offset.
    
               While you can use a full device as a parameter (/dev/sdb),
               always prefer to specify the partition you want to map
               (/dev/sdb1), as only the system partition mode can be detected
               this way.
    
               For mapping images (stored in a file), you can use the
               additional --header option with the real partition device. If
               the --header is used (and it is different from the data
               image), cryptsetup expects that the data image contains a
               snapshot of the data partition only.
    
               If --header is not used (or points to the same image),
               cryptsetup expects that the image contains a full disk
               (including the partition table). This can map a full encrypted
               area that is not directly mountable as a filesystem. Please
               prefer creating a loop device with partitions (**losetup -P** , see
               losetup(8) man page) and use a real partition (/dev/loopXp1)
               as the device parameter.
    
           **--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.
    
           **--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 the
               VeraCrypt device. See the _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.
    


## CRYPTSETUP



           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-TCRYPTDUMP_(8)
    


* * *