makekey man page on UNIXv7

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MAKEKEY(8)							    MAKEKEY(8)

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, upper- and lower-case letters, and `.' and `/'.	The salt char‐
       acters  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 (e.g.  ed  and
       crypt(1)).  Usually its input and output will be pipes.

SEE ALSO
       crypt(1), ed(1)

								    MAKEKEY(8)
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