Destroying Data (Re: Remailer Policies)
honey at citi.umich.edu
Sun Dec 20 07:56:42 PST 1992
> Make sure you don't think 'rm -rf /remailer-logs' actually destroys data.
> It merely de-allocates the i-nodes. You need to know which physical
> device the filesystem is on, (let's call id /hdxxx) and then do
> 'cat /dev/null > /dev/hdxxx' which overwrites with zeroes all data
> on that partition.
not quite. you need something like
dd if=/dev/null of=/dev/xxx bs=verybig conv=sync
this will zero out every block on the disk. but this is overkill --
why not just apply this technique to the individual logs, zeroing
out their data blocks?
ps: is it certain that zeroing out the data blocks thoroughly destroys
the data? i've heard that a "shadow" of some sort may remain.
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