makekey(1)                       DG/UX 5.4.2                      makekey(1)


NAME
       makekey - generate encryption key

SYNOPSIS
       /usr/lib/makekey

DESCRIPTION
       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 (i.e., 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, ., /, and upper and lowercase letters.  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 4,096 cryptographic machines all based on
       the National Bureau of Standards DES algorithm, but broken in 4,096
       different 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 output key bits in the
       result.

       Makekey is intended for programs that perform encryption (e.g., ed(1)
       and crypt(1)).  Usually, its input and output will be pipes.


EXAMPLES
       $ /usr/lib/makekey < inkey > outkey

       The 10 character input key in file "inkey" is encrypted and placed in
       file "outkey".

SEE ALSO
       crypt(1), ed(1).
       passwd(4)















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