TrueCrypt - Free Opensource on the Fly Disk Encryption Tool

[ Thanks to susenator for this link. ]

"Hidden volume stays within an existing encrypted volume thus being invisible to those anyone. Interesting thing about the hidden volume is that to mount a hidden volum, you need to mount the outer or unhidden volume but with the password or key file of the secret volume and it loads up for you. This to me is a very nice feature for a security system to protect confidentiality of your data."

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