# 2.11BSD#431 - /usr/man/cat8/makekey.0

    MAKEKEY(8)	    UNIX Programmer's Manual	       MAKEKEY(8)

    NAME
         makekey - generate encryption key

    SYNOPSIS
         /usr/sbin/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 stan-
         dard input, and writes 13 bytes on its standard output.  The
         output depends on the input in a way intended to be diffi-
         cult 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 char-
         acters are chosen from the same set as the salt and consti-
         tute 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 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 useful key bits in the
         result.

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

    SEE ALSO
         crypt(1), ed(1)

    Printed 11/26/99	October 23, 1996			1

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