Wiping free space on encrypted filesystem.

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Right now, I'm creating a large encrypted filesystem (2gig, maybe I'll
downsize to 1). I am doing "dd if=/dev/urandom". When this is done, I'll
probably use 3DES-ede. Would it help/hurt to, on the mounted fs, do a "dd
if=/dev/urandom of=/cryptdisk/freespacewipefile"?

Thanks,

Ryan

BTW: Does anyone know if 2.2 crypto can work under 2.4?


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