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Annotation of cci/usr/src/man/man8/makekey.8, revision 1.1

1.1     ! root        1: .TH MAKEKEY 8 "4 February 1983"
        !             2: .SH NAME
        !             3: makekey \- generate encryption key
        !             4: .SH SYNOPSIS
        !             5: .B /usr/lib/makekey
        !             6: .SH DESCRIPTION
        !             7: .I Makekey
        !             8: improves the usefulness of encryption schemes depending on a key by
        !             9: increasing the amount of time required to search the key space.  It
        !            10: reads 10 bytes from its standard input, and writes 13 bytes on its
        !            11: standard output.  The output depends on the input in a way intended to
        !            12: be difficult to compute (that is, to require a substantial fraction of
        !            13: a second).
        !            14: .PP
        !            15: The first eight input bytes
        !            16: (the
        !            17: .IR "input key" )
        !            18: can be arbitrary ASCII characters.
        !            19: The last two (the
        !            20: .IR salt )
        !            21: are best chosen from the set of digits, upper- and lower-case
        !            22: letters, and `.' and `/'.
        !            23: The salt characters are repeated as the first two characters of the output.
        !            24: The remaining 11 output characters are chosen from the same set as the salt
        !            25: and constitute the
        !            26: .I "output key."
        !            27: .PP
        !            28: The transformation performed is essentially the following:
        !            29: the salt is used to select one of 4096 cryptographic
        !            30: machines all based on the National Bureau of Standards
        !            31: DES algorithm, but modified in 4096 different ways.
        !            32: Using the input key as key,
        !            33: a constant string is fed into the machine and recirculated a number of times.
        !            34: The 64 bits that come out are distributed into the
        !            35: 66 useful key bits in the result.
        !            36: .PP
        !            37: .I Makekey
        !            38: is intended for programs that perform encryption (for instance,
        !            39: .I ed
        !            40: and
        !            41: .IR crypt (1)).
        !            42: Usually makekey's input and output will be pipes.
        !            43: .SH SEE ALSO
        !            44: crypt(1), ed(1)

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