TrueCrypt 4.3a

TrueCrypt is a software system for establishing and maintaining an on-the-fly-encrypted drive. On-the-fly encryption means that data are automatically encrypted or decrypted right before they are loaded or saved, without any user intervention. No data stored on an encrypted volume can be read (decrypted) without using the correct password or correct encryption key. The entire file system is encrypted (file names, contents of every file).

See also: truecrypt, best crypt, disk encryption, create encrypted disk, virtual disk, create virtual