Destroying data down to the 13th level??? Post: 18932

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Special Forums Hardware Filesystems, Disks and Memory Destroying data down to the 13th level??? Post 18932 by LivinFree on Thursday 4th of April 2002 09:48:31 AM

04-04-2002

Registered User

Ahh...
/dev/urandom is kind of an "enhanced" random... faster and more "random" than /dev/random is...

It very well may be a Linux specific device then (maybe BSD too...).

Also, as a sidenote, the OP could look for a utility like wipe, which will run against a raw device (and is free too).

And now that I think about it, if you're going to use it as a web server and don't want any sensitive recoverable data on it, just zero'ing out the disk should be fine. Any more sophisticated recovery than that would require physical access to the platter, right?

LivinFree

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LEARN ABOUT LINUX

mcookie

MCOOKIE(1)						     Linux Programmer's Manual							MCOOKIE(1)

NAME

       mcookie - generate magic cookies for xauth

SYNOPSIS

       mcookie [-v] [-f filename]

DESCRIPTION

       mcookie generates a 128-bit random hexadecimal number for use with the X authority system.  Typical usage:
	      xauth add :0 . `mcookie`

       The  "random"  number generated is actually the output of the MD5 message digest fed with various pieces of random information: the current
       time, the process id, the parent process id, the contents of an input file (if -f is specified), and several bytes of information from  the
       first of the following devices which is present: /dev/random, /dev/urandom, files in /proc, /dev/audio.

BUGS

       The entropy in the generated 128-bit is probably quite small (and, therefore, vulnerable to attack) unless a non-pseudorandom number gener-
       ator is used (e.g., /dev/random under Linux).

       It is assumed that none of the devices opened will block.

FILES

       /dev/random
       /dev/urandom
       /dev/audio
       /proc/stat
       /proc/loadavg

SEE ALSO

       X(1), xauth(1), md5sum(1)

AVAILABILITY

       The mcookie command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

								 25 September 1995							MCOOKIE(1)