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MCOOKIE(1)				  User Commands 			       MCOOKIE(1)

NAME
       mcookie - generate magic cookies for xauth

SYNOPSIS
       mcookie [options]

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, and optionally the contents of an input file. and several bytes  of	information  from
       the  first  of the following devices which is present: /dev/random, /dev/urandom, files in
       /proc, /dev/audio.

OPTIONS
       -f, --file=FILE
	      Use file as a macig cookie seed. When file is defined as	`-'  character	input  is
	      read from stdin.

       -v, --verbose
	      Explain what is being done.

       -V, --version
	      Output version information and exit.

       -h, --help
	      Display this help and exit.

BUGS
       The  entropy  in the generated 128-bit is probably quite small (and, therefore, vulnerable
       to attack) unless a non-pseudorandom number generator 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.ker-
       nel.org/pub/linux/utils/util-linux/.

util-linux				    June 2011				       MCOOKIE(1)
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