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makekey(8)							   makekey(8)


  makekey - generate encryption	key



  The makekey command 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	stan-
  dard output.	The output depends on the input	in a way intended to be	dif-
  ficult to compute (that is, to require a substantial fraction	of a second).

  The first eight input	bytes (the "input key")	can be arbitrary ASCII char-
  acters.  The last two	(the salt) are best chosen from	the set	of digits,
  uppercase and	lowercase letters, the period (.), and the slash (/).  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 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.

  The makekey command is intended for programs that perform encryption (for
  instance, ed.	 Usually input and output for makekey are pipes.


  Commands:  crypt(1), ed(1), ex(1), vi(1)