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Annotation of researchv10dc/man/man8/makekey.8, revision 1.1

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

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