[ Thanks to doloresp for this link.
]
“If you want to encrypt your sensitive files so that no one can
access them without your personal password or decryption key, you
have several options. But if you want a free, cross-platform, open
source encryption application, try TrueCrypt.“TrueCrypt encrypts and decrypts files on the fly, as they are
loaded or saved, without user intervention. TrueCrypt can encrypt
files and store them in a container file that acts as a virtual
disk, or make an entire partitions or disk into an encrypted volume
in both Microsoft and Linux. The software depends on a personal
password or key that you create when configuring a TrueCrypt
volume. Without this key, no data on an encrypted volume can be
read (not even offline)…”