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Annotation of 43BSDTahoe/man/man8/makekey.8, revision 1.1

1.1     ! root        1: .\"    @(#)makekey.8   6.1 (Berkeley) 4/27/85
        !             2: .\"
        !             3: .TH MAKEKEY 8 "April 27, 1985"
        !             4: .AT 3
        !             5: .SH NAME
        !             6: makekey \- generate encryption key
        !             7: .SH SYNOPSIS
        !             8: .B /usr/lib/makekey
        !             9: .SH DESCRIPTION
        !            10: .I Makekey
        !            11: improves the usefulness of encryption schemes depending on a key by
        !            12: increasing the amount of time required to search the key space.  It
        !            13: reads 10 bytes from its standard input, and writes 13 bytes on its
        !            14: standard output.  The output depends on the input in a way intended to
        !            15: be difficult to compute (that is, to require a substantial fraction of
        !            16: a second).
        !            17: .PP
        !            18: The first eight input bytes
        !            19: (the
        !            20: .IR "input key" )
        !            21: can be arbitrary ASCII characters.
        !            22: The last two (the
        !            23: .IR salt )
        !            24: are best chosen from the set of digits, upper- and lower-case
        !            25: letters, and `.' and `/'.
        !            26: The salt characters are repeated as the first two characters of the output.
        !            27: The remaining 11 output characters are chosen from the same set as the salt
        !            28: and constitute the
        !            29: .I "output key."
        !            30: .PP
        !            31: The transformation performed is essentially the following:
        !            32: the salt is used to select one of 4096 cryptographic
        !            33: machines all based on the National Bureau of Standards
        !            34: DES algorithm, but modified in 4096 different ways.
        !            35: Using the input key as key,
        !            36: a constant string is fed into the machine and recirculated a number of times.
        !            37: The 64 bits that come out are distributed into the
        !            38: 66 useful key bits in the result.
        !            39: .PP
        !            40: .I Makekey
        !            41: is intended for programs that perform encryption (for instance,
        !            42: .I ed
        !            43: and
        !            44: .IR crypt (1)).
        !            45: Usually makekey's input and output will be pipes.
        !            46: .SH SEE ALSO
        !            47: crypt(1), ed(1)

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