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How to encrypt external hard drive to be readable on any OS?

Anyone know any program that works in Ubuntu to encrypt files/disk? I'm looking for something that will ask you for a password to open files when you plug in the pendrive/portable hard disk. If possible, is there any program that can run in both Ubuntu and Windows 7?

marked as duplicate by Marco Ceppi Jun 5 '11 at 20:36

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You can encrypt a file using GPG: http://www.linuxdynasty.org/how-to-encrypt-file-using-gpg.html

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