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Cryptmount - Lets You Mount Encrypted Files Without Root Privileges


Cryptmount is a software tool written in C, that enables users for managing encrypted file systems under the Linux operating systems. It uses the device mapper and dm-crypt infrastructure to provide transparent encryption of file systems stored in disk partitions or within ordinary files.

With it you can mount encrypted files without root privileges.

It works using the newer devmapper mechanism which offers several advantages including improved functionality in the kernel, support for encrypted swap partitions for superusers, support for crypto-swap at system boot, storing multiple encrypted filesystems in a single disk, etc.

dm-crypt is a transparent disk encryption subsystem in Linux kernel versions 2.6 and later and in DragonFly BSD. It is part of the device mapper infrastructure, and uses cryptographic routines from the kernel's Crypto API. Unlike its predecessor cryptoloop, dm-crypt was designed to support advanced modes of operation, such as XTS, LRW and ESSIV (see disk encryption theory for further information), in order to avoid watermarking attacks. In addition to that, dm-crypt also addresses some reliability problems of cryptoloop.

dm-crypt is implemented as a device mapper target and may be stacked on top of other device mapper transformations. It can thus encrypt whole disks (including removable media), partitions, software RAID volumes, logical volumes, as well as files. It appears as a block device, which can be used to back file systems, swap or as an LVM physical volume.

Some Linux distributions support the use of dm-crypt on the root file system. These distributions use initrd to prompt the user to enter a passphrase at the console, or insert a smart card prior to the normal boot process.

License: GNU/GPL
Version: 5.2.2 is available in Debian Stables repository.

The main features of cryptmount include:

  • An interactive setup script is supplied to allow basic, but effective, encrypted file systems to be created.
  • Filesystems can be (un)mounted whenever needed by ordinary users, without requiring superuser/administrator privileges.
  • Multiple encrypted filesystems can be stored within a single disk partition. Encrypted swap partitions are supported and can be configured automatically on system boot-up.
  • Configuration information about encrypted filesystems is stored within a free-format human-readable file.
  • Access keys can be protected by a wide range of encryption and hashing algorithms provided by the libgcrypt library, which can be compatible with the OpenSSL command-line tool. They can be stored and backed-up separately from the filesystem that they protect.

How to install Cryptmount via a terminal window:

sudo apt-get install cryptomount

Press Enter, done.

If you want the latest version 5.3.1-1, you need to download it from here.

IMPORTANT! If you use Firefox SNAP version, move the file from snap/firefox/common/Downloads to Downloads or other directory, then cd into it.

Next go to Downloads:

cd Downloads

Press Enter,

sudo dpkg -i cryptmount_5.3.1-1_amd64.deb

Press Enter, done.

Notice: Don't logout the user owning the volume, without unmounting it, because you might have difficulites unmounting it afterwards. However, try as root.

Type the following command:

unmount -l

Press Enter, done. It should now be unmounted after a restart.

Manual: Installation

Manual: Usage

Developers website


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