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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.
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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