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Ubuntu Privacy Remix is a modified live CD based on Ubuntu Linux. UPR is not intended for permanent installation on a hard disk. The goal of Ubuntu Privacy Remix is to provide an isolated working environment where private data can be dealt with safely. The system installed on the computer running UPR remains untouched. It does this by removing support for network devices as well as local hard disks. Ubuntu Privacy Remix includes TrueCrypt and GnuPG for encryption and introduces "extended TrueCrypt volumes".

CryptoFS is a encryption filesystem for Filesystem in Userspace and Linux Userland Filesystem. Files written to the mount point will be stored encrypted (data and filename) in a directory on a normal filesystem.

Fingerprint Verification System is an easy-to-use library that allows programmers to integrate fingerprint technology into their software without specific know-how. It is fast and small, and is great for embedded systems.

mcrypt is a program for encrypting files or
streams. It is intended to be a replacement for
the old UNIX crypt. It uses well-known and
well-tested algorithms like BLOWFISH, AES,
ARCFOUR, CAST-128, and more in several modes of
operation. It also has a compatibility mode with
the old UNIX crypt program and the des program
found in Solaris.

J2SSH is an object-orientated Java implementation of the SSH version 2 protocol. It provides a rich, powerful, and extensible SSH API that enables developers to gain access to SSH servers and to develop entire SSH client/server frameworks. The API library provides a fully-featured SSH2 implementation specifically designed for cross-platform development. Higher level components, representing both the standard SSH client and SSH servers, are provided which implement the protocol specification for user sessions and port forwarding. The specification currently supports public key and password authentication and a full implementation of the SFTP protocol.

PHP Secure Communications Library is a set of pure
PHP implementations of DES, 3DES, RC4, Rijndael,
AES, RSA (PKCS#1 compliant [v2.1]), SSH-1, SSH-2, and SFTP.

SSLsplit is a tool that performs man-in-the-middle attacks against SSL/TLS encrypted network connections for network forensics and penetration testing. It terminates SSL/TLS and initiates a new connection to the original destination, logging all data transmitted. It supports plain TCP and SSL, HTTP and HTTPS, and IPv4 and IPv6. For SSL and HTTPS, it generates and signs forged X509v3 certificates on-the-fly using the original certificate's subject DN and subjectAltName extension. It supports Server Name Indication, RSA, DSA, and ECDSA keys, and DHE and ECDHE cipher suites. It can also use existing certificates if the private key is available.

GNU Anubis is an SMTP message submission daemon. It represents an intermediate layer between the mail user agent (MUA) and mail transport agent (MTA), receiving messages from the MUA, applying to them a set of predefined changes, and finally inserting modified messages into an MTA routing network. The set of changes applied to a message is configurable on a system-wide and per-user basis. The built-in configuration language used for defining sets of changes allows for considerable flexibility and is easily extensible.

cpm (Console Password Manager) is a small console
tool to manage passwords and other sensitive data and store them in a public-key encrypted file. It also allows you to configure the whole hierarchy yourself, so it's easily adoptable for many requirements.
The encryption is handled through GnuPG, and the data
inside is stored as XML.

BeeCrypt is an ongoing project to provide strong and fast cryptography in the form of a toolkit usable by commercial and open source projects. Included in the library are entropy sources, random generators, block ciphers, hash functions, message authentication codes, multiprecision integer routines, and public key primitives.