SDMEM

Description

SDMEM  is designed to delete data which may lie still in your memory (RAM) in a secure manner which can not be recovered by thiefs, law enforcement or other threats. Note that with the new SDRAMs, data will not wither away but will be kept static – it is easy to extract the necessary information! 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 sdmem goes like this:

* 1 pass with 0x00 *

5 random passes. /dev/urandom is used for a secure RNG if available.

* 27 passes with special values defined by Peter Gutmann.

* 5 random passes. /dev/urandom is used for a secure RNG if available.

Usage

Syntax

sdmem [-flv]

Options

	-f  fast (and insecure mode): no /dev/urandom.
	-l  lessens the security (use twice for total insecure mode).
	-v  is verbose mode.

Example

cyborg@cyborg:~$ sudo sdmem -f -v
[sudo] password for cyborg: 
Starting Wiping the memory, press Control-C to abort earlier. Help: "sdmem -h"
Wipe mode is secure (38 special passes)
******************************************************************************************************************
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