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Annotation of 43BSDReno/libexec/makekey/makekey.8, revision 1.1.1.1

1.1       root        1: .\"    @(#)makekey.8   6.2 (Berkeley) 6/24/90
                      2: .\"
                      3: .TH MAKEKEY 8 "June 24, 1990"
                      4: .AT 3
                      5: .SH NAME
                      6: makekey \- generate encryption key
                      7: .SH SYNOPSIS
                      8: .B 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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