Protecting private key on USB flash drive: how to?

[Arnaud Ongenae]

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I just discover Truecrypt and there is a very interesting feature, the
hidden volume (http://www.truecrypt.org/hiddenvolume.php) it could be
good to use it for this case.
unfortunately, it should be created on a win machine :'(, moreover I
don't know if it's possible to use this feature with a key file (never
try).

I would like to know if there is a way to use my gpg key from a usb
drive, so my private key is not imported on the new computer ?
(symbolic link or ... I don't know)

_-Arnaud-_

ps: sorry vedaal I have done a mistake while I reply


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