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Manpages MCOOKIESection: Linux Programmer's Manual (1)Updated: 25 September 1995 Index Return to Main Contents NAMEmcookie - generate magic cookies for xauthSYNOPSISmcookie [-v] [-f filename ]DESCRIPTIONmcookie generates a 128-bit random hexadecimal number for use with the X authority system. Typical usage:
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. BUGSThe 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 ALSOX(1), xauth(1), md5sum(1)
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