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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 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/.

					25 September 1995			       MCOOKIE(1)
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