MAKEKEY(M)               XENIX System V                MAKEKEY(M)



     Name
          makekey - Generates an encryption key.

     Syntax
          /usr/lib/makekey

     Description
          makekey improves the usefulness of encryption schemes 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 that is intended to be difficult to
          compute (i.e., to require a substantial fraction of a
          second).

          The first 8 input bytes (the input key) can be arbitrary
          ASCII characters.  The last 2 input bytes (the salt) are
          best chosen from the set of digits, dot (.), slash (/), and
          uppercase and lowercase letters.  The salt characters are
          repeated as the first 2 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 the key, a constant string is fed into the
          machine and recirculated.  The 64 bits that come out are
          distributed into the 66 output key bits in the result.

     See Also
          passwd(M)






















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