Le 23 déc. 09 à 13:44, Osamu Aoki a écrit :
Package: zerofree Version: 1.0.1-1 Severity: wishlist(Just think about photo collection in ext2 disk. You erase some photosthere but usually file contents stay on the storage media.) Your package description and manpage states:| Zerofree has been written to be run from GNU/Linux systems installed as| guest OSes inside a virtual machine. If this is not your case, you | almost certainly don't need this package. I can think of use of zerofree not only for fancy virtual machine environment but for normal PC with USB memory etc. You can improve data security of ext2/ext3 formatted disk by using zerofree after erasing (possibly sensitive) files on it without completely overwriting remaining non-sensitive data. This seems handy for ext2 formatted USB memory stick when exchanging data etc on it. Since we never remember what sensitive data we placed, it is alwasysgood idea to use zerofree if you are not so keen to do "dd if=/dev/ zero"and mkfs etc.
yes and no. Indeed, the MS Windows tool used instead of zerofree is sdelete, a secure delete tool too make it really hard to undelete sensitive information.
On the other hand, my understanding is that it is not enough to zero the disk once. You have to write several times to really make professionals unable to retrieve erased data. so "dd if=/dev/random of=junk ... ; rm junk" several times looks like a much safer option to me.
Of course, zeroing once is enough to prevent most of your friends from undeleting your secret diary notes. For that matter, most of your friends wouldn't be able to retrieve the "sensitive" data even if only rm has been used.
Regards, Thibaut. --* Dr Thibaut Paumard | LESIA/CNRS - B. Lyot (n °6) * * Tel: +33 1 45 07 75 45 | Observatoire de Paris - Section de Meudon * * Fax: +33 1 45 07 79 17 | 5, Place Jules Janssen * * [email protected] | 92195 MEUDON CEDEX (France) *
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