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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 pieces of ran-
       dom 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 Linux).

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


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

       The   mcookie   command   is   part   of  the  util-linux-ng  package  and  is  available  from  ftp://ftp.ker-

                               25 September 1995                    MCOOKIE(1)