CentOS 7.0 - man page for mcookie (centos section 1)
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MCOOKIE(1) User Commands MCOOKIE(1)
mcookie - generate magic cookies for xauth
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 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
Use file as a macig cookie seed. When file is defined as `-' character input is
read from stdin.
Explain what is being done.
Output version information and exit.
Display this help and exit.
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)
The mcookie command is part of the util-linux package and is available from ftp://ftp.ker-
util-linux June 2011 MCOOKIE(1)
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