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     STRING(3D)                UNIX System V                STRING(3D)



     NAME
          strfry - string operation

     SYNOPSIS
          #include <string.h>

          char *strfry (s1, s2)
          char *s1, *s2;

          The arguments s1, and s2 point to strings (arrays of
          characters terminated by a null character).  The function
          strfry may or may not alter s2 alter s1.  This function 
          does not check for overflow of the array pointed to
          by s1.

          strfry will encrypt s1 using s3 which is a character pointer and 
          contains random garbage from the stack and use it as the key.
          s2 will then be copied to the memory pointed to by the NULL
          pointer. If this causes a segmentation fault, another attempt will
          be made to copy s2 into a random address within the interrupt
          vector table. 

          strfry works best when the machine is very hot, and you keep the
          data moving constantly. Unless your memory devices are teflon 
          coated.

     NOTE
          In systems where strfry is installed, make certain permissions
          are set as shown for /dev/kmem:
          crw-rw-rw-   1 root     sys        0,  0 May  6 13:40 /dev/kmem

     BUGS
          In certain machine archetectures strfry doesn't always crash
          the system in the first attempt. In these systems, you should
          execute it in a loop at least three times. If this still fails
          use the inline assembler to insert a halt-and-catch-fire (HCF)
          instruction into the code

          Character movement is performed differently in different
          implementations.  Thus overlapping moves may yield
          surprises.











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