Need to quickly encrypt a file or an archive? You can do this using the GPG encryption software which is installed by default on many mainstream Linux distributions.

Crypt manager is a compilation of tools which allow to easily encrypt, open, close and uncrypt folders in a Desktop environment. It is wrote in Python, it uses cryptsetup and LUKS as backend.

dm-crypt is a device-mapper target that provides transparent encryption of block devices using the new Linux 2.6 cryptoapi.

Add some secret ninja power to your Ubuntu system today with Easy Crypt. With only a right click you can open or close a ‘top secret’ file, protected by military grade encryption (AES 512-bit Whirlpool). Easy Crypt is a cute little menu which brings the power of TrueCrypt to your system tray. No terminal commands necessary.

Truecrypt is an open-source tool to encrypt data for Linux, Windows and Mac OSX. Truecrypt will create a virtual disk within a file and mount it as a disk. It can encrypt an entire partition or drive, even a USB flash drive. One nice thing about the encryption is that it is real-time and transparent.

Even if you have done nothing wrong, the government agencies examining your files have no contractual obligation to you to keep them safe, nor even to get rid of all their copies once they've determined you're not guilty or that they pulled the wrong party's data.

eMount is a free system administrator tool for Linux which can mount, encrypt and manage disk image files and physical disk drives. It relies on cryptsetup which implements the LUKS disk encryption

Everyone has secrets. Some of yours probably live on your computer. If you want to keep digital information private, locking it behind a password won’t really keep it secure. TrueCrypt can encrypt and decrypt files, documents, and even entire filesystems.

One of the best ways to protect sensitive computer data like credit card numbers and social security information is to use encryption software. Encryption software executes an algorithm that is designed to encrypt data in such a way that it cannot be recovered (decrypted) without access to the key. It is a main component of all aspects of file protection and computer communication.