Last Change: 2018-09-07, 16:50
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sswap − secure swap wiper (secure_deletion toolkit)
sswap [-f] [-l] [-l] [-v] [-z] swapdevice
sswap is designed to delete data which may lie still on your swapspace in a secure manner which can not be recovered by thiefs, law enforcement or other threats. The wipe algorythm is based on the paper "Secure Deletion of Data from Magnetic and Solid-State Memory" presented at the 6th Usenix Security Symposium by Peter Gutmann, one of the leading civilian cryptographers.
The secure data deletion process of sswap goes like this:
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* |
1 pass with 0xff |
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* |
5 random passes. /dev/urandom is used for a secure RNG if available. |
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* |
27 passes with special values defined by Peter Gutmann. |
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* |
5 random passes. /dev/urandom is used for a secure RNG if available. |
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−f |
fast (and insecure mode): no /dev/urandom, no synchronize mode. |
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−l |
lessens the security. Only two passes are written: one mode with 0xff and a final mode with random values. |
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−l |
-l for a second time lessons the security even more: only one pass with random values is written. |
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−v |
verbose mode |
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−z |
wipes the last write with zeros instead of random data |
swapoff
unmount your swapspace before using this tool! Otherwise your system might crash!
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BETA! |
sswap is still beta. It was only tested on Linux but on this system it performed it’s work all of the time. |
No bugs. There was never a bug in the secure_deletion package (in contrast to my other tools, whew, good luck ;-) Send me any that you find. Patches are nice too :)
van Hauser / THC <vh AT thc DOT org>
The newest version of the secure_deletion package can be obtained from http://www.thc.org
sswap and the secure_deletion package is (C) 1997-2003 by van Hauser / THC (vh AT thc DOT org)
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; Version 2.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
srm (1), sfill (1), smem (1)