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MAKEKEY(8)                  System Manager's Manual                 MAKEKEY(8)

       makekey - generate encryption key


       makekey  improves  the  usefulness of encryption schemes depending on a
       key by increasing the amount of time required to search the key  space.
       It  reads  10 bytes from its standard input, and writes 13 bytes on its
       standard output.  The output depends on the input in a way intended  to
       be  difficult to compute (that is, to require a substantial fraction of
       a second).

       The first eight input bytes (the input  key)  can  be  arbitrary  ASCII
       characters.   The  last  two (the salt) are best chosen from the set of
       digits, upper- and lower-case letters, and  `.'   and  `/'.   The  salt
       characters are repeated as the first two characters of the output.  The
       remaining 11 output characters are chosen from the same set as the salt
       and constitute the output key.

       The  transformation performed is essentially the following: the salt is
       used to select one of 4096 cryptographic  machines  all  based  on  the
       National  Bureau  of Standards DES algorithm, but modified in 4096 dif-
       ferent ways.  Using the input key as key, a constant string is fed into
       the  machine and recirculated a number of times.  The 64 bits that come
       out are distributed into the 66 useful key bits in the result.

       makekey is intended for programs that perform encryption (for instance,
       ed(1) and crypt(1)).  Usually makekey's input and output will be pipes.

       crypt(1), ed(1)

                               9 September 1987                     MAKEKEY(8)