cryptmount is a utility for creating and managing secure filing systems on GNU/Linux systems. After initial setup, it allows any user to mount or unmount filesystems on demand, solely by providing the decryption password, with any system devices needed to access the filing system being configured automatically. A wide variety of encryption schemes (provided by the kernel dm-crypt system and the libgcrypt library) can be used to protect both the filesystem and the access key. The protected filing systems can reside in either ordinary files or disk partitions. The package also supports encrypted swap partitions, and automatic configuration on system boot-up.
GNUnet is a peer-to-peer framework with focus on providing security. All peer-to-peer messages in the network are confidential and authenticated. The framework provides a transport abstraction layer and can currently encapsulate the network traffic in UDP, TCP, HTTP, HTTPS, or direct 802.11 (WLAN). GNUnet supports accounting to provide contributing nodes with better service. The services built on top of the framework include anonymous file sharing and a virtual network providing IPv4-IPv6 transition via protocol translation over the P2P network.
EncFS is an encrypted pass-through filesystem which runs in userspace on Linux (using the FUSE kernel module). Similar in design to CFS and other pass-through filesystems, all data is encrypted and stored in the underlying filesystem. Unlike loopback filesystems, there is no predetermined or pre-allocated filesystem size.
FreeOTFE4PDA is an "on-the-fly" (OTFE) transparent disk encryption program. Using this software, you can create one or more "virtual memory cards" on your PDA. Anything written to one of these cards will be automatically and securely encrypted before being stored. A PC version is also available, allowing data encrypted on your PC to be read/written on your PDA, and vice-versa.
Krypt is a simple application that sits in the system tray and provides easy access to the list of volumes encrypted with LUKS. It is possible to quickly decrypt, encrypt back, mount, and umount such devices. It also monitors HAL activity, and responds by showing a pop-up with password prompt. When the password is provided, KDE's media manager kicks in and does its job. Passwords for volumes can be stored either in a configuration file or in KDE Wallet.
FSFS is a secure, distributed, scalable, user-space file system that exports existing directories securely over the network, letting users store and retrieve encrypted data in a transparent way. FSFS is written as a pair of user space daemons that act as clients and servers. Servers export an existing file system (of virtually any kind) to clients over the network.
eCryptfs is an POSIX-compliant enterprise-class stacked cryptographic filesystem for Linux. It is derived from Erez Zadok's Cryptfs, implemented through the FiST framework for generating stacked filesystems. It extends Cryptfs to provide advanced key management and policy features. It 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 it as a sort of "gnupgfs.'' It is a native Linux filesystem, and can be built and distributed as a stand-alone kernel module for Linux 2.6.15 or higher.