DFF (Digital Forensics Framework) is a simple but powerful tool with a flexible module system which will help you in your digital forensics works, including file recovery due to error or crash, evidence research and analysis, etc. DFF provides a robust architecture and some handy modules.
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.
MinorFS combines a small set of cooperating userspace filesystems for Linux that provide private storage to pseudo persistent processes. This allows programs that are run by a user to keep some data safe from all potential malware that runs with all this users' privileges. It further implements simple password capabilities as a way to explicitly share access with other processes or users.
ext2hide allows the user to save and restore an arbitrary number of files to and from the reserved space in an ext2/3 filesystem's primary and backup superblocks. Using ext2hide, you can use this reserved section to store an arbitrary number of files, where they will be completely invisible to normal filesystem utilities, but still residing in permanent storage on disk. This can be useful for passwords, public keys, anything you like.
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.
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.
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.