Free encryption software for linux

FireFTP project is a free, secure, cross-platform FTP client for Mozilla Firefox.

FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.

Along with transferring your files quickly and efficiently, FireFTP also includes more advanced features such as: directory comparison, syncing directories while navigating, SSL encryption, file hashing, and much more!

Kasablanca is an ftp client, written in c++, using the kde libraries. among its features are
currently encryption (auth tls) support, fxp, site bookmarks, and queued transfers.
Main features:
- ftps encryption via AUTH TLS, read here for more information regarding ftps.
- fxp (direct server to server transfer), supporting alternative mode.
- advanced bookmarking system.
- fast responsive multithreaded engine.
- concurrent connections to multiple hosts.
- interactive transfer queue, movable by drag and drop.
- small nifty features, like a skiplist.
Enhancements:
- changed: changed the local dir deletion functionality for a profane call to "rm".
- added: hour and minute is now taken into respect when sorting by date
- fixed: finally files bigger than 2gb should be supported on machines which support LFS
- fixed: crash when transfering files on a timed-out server
- changed: view of the transfered files
- added: a little fancyness and improvements
- fixed: percentage counting bug
- added: delete key shortcut bookmarks [r. stellingwerff]
- fixed: several bugs in ftplibpp

Weplab is a tool to review the security of WEP encryption in wireless networks from an educational point of view.
Several attacks are available so it can be measured the efectiveness and minimun requirements of each one.
Weplab helps you to understand and analyze the security weaknesses present on WEP encryption for wireless networks. Different attacks using several vulnerabilities can be launched.
The user can play with lots of cracking parameters so it is easier to understand what the algoritm is doing and how easy or difficult is to crack the WEP key.
Enhancements:
- Stupid bug with small packets (like arp) fixed. Minimun size decreased to 20 bytes. Now weplab works like a charm with a arp replay attack (aireplay).
- Prints the right ascii password when a key is cracked using the dictionary mode.

PHP Screw is a PHP script encryption tool. When you are developing a commercial package using PHP, the script can be distributed as encrypted up until just before execution, preserving your intellectual property.

BackPack is a little script that performs a selective backup of selected directories and Debian package configurations. BackPack can regularly add support for more backup options such as MySQL, GPG encryption, etc.
Enhancements:
- Backpack now supports selective backup encoding options.
- GPG options were tweaked a bit more to speed up the encryption.
- Lots of fixes were made here and there, and code cleanup was done.
- A new bug tracker is also up.

CryptoMX Tools is a set of encryption, steganography, cipher, hashing and conversion tools designed to work on any operating system with any Javascript-capable browser.
Enhancements:
- Added SHA-256 Algorithm.
- Used COPYING, README, AUTHORS, and ChangeLog Files.
- Removed a bit of useless code.
- Decreased Filesize.
- Misc. Fixes.

net6 is a library which eases the development of network-based applications. net6 library provides a TCP protocol abstraction for C++.
Enhancements:
- Encryption support through GNUTLS
- Interface changes in the selector
- Allow the use of the net6 protocol with Unix domain sockets
- Send keep-alives to detect dropped clients