mount -t ecryptfs [SRC DIR] [DST DIR] -o [OPTIONS]
eCryptfs is a POSIX-compliant enterprise-class stacked cryptographic
filesystem for Linux. It is derived from Erez Zadok's Cryptfs, imple-
mented through the FiST framework for generating stacked filesystems.
eCryptfs extends Cryptfs to provide advanced key management and policy
features. eCryptfs stores cryptographic metadata in the header of each
file written, so that encrypted files can be copied between hosts; the
file will be decryptable with the proper key, and there is no need to
keep track of any additional information aside from what is already in
the encrypted file itself. Think of eCryptfs as a sort of "gnupgfs."
Parameters that apply to the eCryptfs kernel module.
Specify the signature of the mount wide authentication token.
The authentication token must be in the kernel keyring before
the mount is performed. ecryptfs-manager or the eCryptfs mount
helper can be used to construct the authentication token and add
it to the keyring prior to mounting.
Specify the signature of the mount wide authentication token
used for filename crypto. The authentication must be in the ker-
nel keyring before mounting.
Specify the symmetric cipher to be used on a per file basis
Specify the keysize to be used with the selected cipher. If the
cipher only has one keysize the keysize does not need to be
Allows for non-eCryptfs files to be read and written from within
an eCryptfs mount. This option is turned off by default.
Do not check the mount key signature against the values in the
user's ~/.ecryptfs/sig-cache.txt file. This is useful for such
things as non-interactive setup scripts, so that the mount
helper does not stop and prompt the user in the event that the
key sig is not in the cache.
rather than the header region of the lower files.
Log ecryptfs information to /var/log/messages. Do not run
eCryptfs in verbose-mode unless you are doing so for the sole
purpose of development, since secret values will be written out
to the system log in that case.
MOUNT HELPER OPTIONS
Parameters that apply to the eCryptfs mount helper.
key=(keytype):[KEY MODULE OPTIONS]
Specify the type of key to be used when mounting eCryptfs.
Specify whether filename encryption should be enabled. If not,
the mount helper will not prompt the user for the filename
encryption key signature.
If verbosity=1, the mount helper will ask you for missing values
(default). Otherwise, if verbosity=0, it will not ask for miss-
ing values and will fail if required values are omitted.
KEY MODULE OPTIONS
Parameters that apply to individual key modules have the alias
for the key module in the prefix of the parameter name. Key mod-
ules are pluggable, and which key modules are available on any
given system is dependent upon whatever happens to be installed
in /usr/lib*/ecryptfs/. By default, this includes, at a minimum,
"passphrase" and "openssl."
The actual password is passphrase. Since the password is visible
to utilities (like ps under Unix) this form should only be used
where security is not important.
The password should be specified in a file with
passwd=(passphrase). It is highly reccomended that the file be
stored on a secure medium such as a personal usb key.
The password is specified through the specified file descriptor.
The salt should be specified as a 16 digit hex value.
The password can be specified on the command line. Since the
password is visible in the process list, it is highly recom-
mended to use this option only for testing purposes.
The following command will layover mount eCryptfs on /secret with a
passphrase contained in a file stored on secure media mounted at
mount -t ecryptfs -o
key=passphrase:passphrase_passwd_file=/mnt/usb/file.txt /secret /secret
Where file.txt contains the contents "passphrase_passwd=[passphrase]".
Do not run eCryptfs in verbose-mode unless you are doing so for the
sole purpose of development, since secret values will be written out to
the system log in that case. Make certain that your eCryptfs mount cov-
ers all locations where your applications may write sensitive data. In
addition, use dm-crypt to encrypt your swap space with a random key on
boot, or see ecryptfs-setup-swap(1).
Passphrases have a maximum length of 64 characters.
Please post bug reports to the eCryptfs bug tracker on Launchpad.net:
For kernel bugs, please follow the procedure detailed in Documenta-
tion/oops-tracing.txt to help us figure out what is happening.
This manpage was (re-)written by Dustin Kirkland <firstname.lastname@example.org>
for Ubuntu systems (but may be used by others). Permission is granted
to copy, distribute and/or modify this document under the terms of the
GNU General Public License, Version 2 or any later version published by
the Free Software Foundation.
On Debian systems, the complete text of the GNU General Public License
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