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RedHat 9 (Linux i386) - man page for mcookie (redhat section 1)

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

       mcookie - generate magic cookies for xauth

       mcookie [-v] [-f filename ]

       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	piece 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.

       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

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


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

					25 September 1995			       MCOOKIE(1)
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