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Rsyncrypto allows you to encrypt a file or a
directory structure such that they can later be
synchronized to another machine using rsync. This
means that local changes to the plain text file
result in local changes to the cipher text file.
rsyncrypto compresses the plain text file prior to
encrypting it with gzip using the "rsyncable"
patch, which is available from the rsync sources.

ssh-keyinstall is a script that helps an ssh user
set up the keys at both ends of an ssh connection.
It creates an rsa or dsa key if needed and copies
the public half to the server. Once the process
is done, you'll be able to log in with the
passphrase and key instead of a password.

arc is an ASN.1 compiler written by FORGE Research for use in internal projects. It is being released under a BSD-like licence. arc creates Java source code that uses the basic ASN.1 classes that were created for use with other FORGE projects. These basic ASN.1 classes are included in the arc distribution.

Privatix Live-System is a portable encrypted operating system designed to be run directly from a USB flash drive or an external hard drive. This allows the user to safely edit and carry along sensitive data for encrypted communication and anonymous Web surfing. It is based on Debian GNU/Linux.

MUTE File Sharing is an anonymous, decentralized search-and-download file sharing system. Several people have described MUTE as the "third generation file sharing network" (From Napster to Gnutella to MUTE, with each generation getting less centralized and more anonymous). MUTE uses algorithms inspired by ant behavior to route all messages, include file transfers, through a mesh network of neighbor connections.

vpnd is a daemon which connects two networks on network level either via TCP/IP or a (virtual) leased line attached to a serial interface. All data transfered between the two networks are encrypted using the unpatented free Blowfish encryption algorithm with a key length of up to 576 bits (may be downgraded to a minimum of 0 bits to suit any legal restrictions).

Ganymed SSH-2 for Java is a library that implements the SSH-2 protocol in pure Java (tested on J2SE 1.4.2, 5, and 6). It allows one to connect to SSH servers from within Java programs. It supports SSH sessions (remote command execution and shell access), local and remote port forwarding, local stream forwarding, X11 forwarding, SCP, and SFTP. There are no dependencies on any JCE provider, as all cryptographic functionality is included.

aescrypt2 is a command line file encryption
program that relies on AES-CBC-256 plus
HMAC-SHA256. It has been designed to be portable
(works on all Unix flavors and Win32) as well as
very straightforward to use.

Figaro's Password Manager (FPM) is a GNOME application that allows you to securely store your passwords, which are encrypted with the blowfish algorithm. It allows you to copy passwords or usernames to the clipboard or primary selection. If a password is for a Web site, FPM can keep track of the URLs of your login screens and can automatically launch your browser. You can also teach FPM to launch other applications. FPM can sort your passwords into categories. Finally, it has a password generator that can help you choose good passwords.

fsh is a tool for establishing an ssh tunnel for
remote execution of commands without requiring an
ssh authentication on every connection. Once the
tunnel is established, remote commands can be
executed almost instantaneously. This makes
systems such as remote cvs over ssh much faster.
It includes fcp, an rcp variant that uses fsh.

PortableSigner is a Java application to sign
normal PDF files with a
digital signature (X.509). You can verify your
signature by opening the
PDF file in a standard Adobe Reader without any
plugins.

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.

The modular syslog allows for an easy implementation of input and output modules. The modules that mantain compatibility with its precursor are included in the standard distribution along with four modules: om_peo (an implementation of PEO-1 and L-PEO, two algorithmic protocols for integrity checking), om_mysql and om_pgsql (modules that sends output to a mysql and postgresql database, respectively) and om_regex (a module that allows output redirection using regular expressions).

UsbCryptFormat is a graphical user interface (GUI) for the encryption of USB flash drives or external hard drives. It allows the user to reformat a USB flash drive, an SD card, or an external hard drive with an encrypted filesystem very easily and without the danger of destroying data on an internal hard drive because of incautious handling of device names. So it is usable even for a layperson.