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APG v2.0.0a0

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Adel I. Mirzazhanov
2001-03-21 10:46:44 +06:00
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.\" Man page for apgbfm.
.\" Licensed under BSD-like License.
.\" Created by Adel I. Mirzazhanov
.\"
.TH APGBFM 1 "2001 Mar 18" "Automated Password Generator" "User Manual"
.SH NAME
apg
\- APG Bloom filter management program
.SH SYNOPSIS
.B apgbfm
\fB-f\fP \fIfilter\fP \fB-n\fP \fBnumofwords\fP
.br
.B apgbfm
\fB-f\fP \fIfilter\fP \fB-d\fP \fIdictfile\fP
.br
.B apgbfm
\fB-f\fP \fIfilter\fP \fB-a\fP \fBword\fP
.br
.B apgbfm
\fB-f\fP \fIfilter\fP \fB-A\fP \fIdictfile\fP
.br
.B apgbfm
\fB-f\fP \fIfilter\fP \fB-c\fP \fBword\fP
.br
.B apgbfm
\fB-f\fP \fIfilter\fP \fB-C\fP \fIdictfile\fP
.br
.B apgbfm
[\fB-v\fP] [\fB-h\fP]
.PP
.SH DESCRIPTION
.B apgbfm
is used to manage Bloom filter that is used to restrict password generation
in \fBAPG\fP pasword generation software. Usage of the Bloom filter allows to speed
up password check for large dictionaries and has some other benefits.
.PP
The idea to use Bloom filter for that purpose is came from the description of
the \fBOPUS\fP project \fBOPUS: Preventing Weak Password Choices\fP
\fIPurdue Technical Report CSD-TR 92-028\fP writen by \fIEugene H. Spafford\fP.
.PP
You can obtain this article from:
.br
\fIhttp://www.cerias.purdue.edu/homes/spaf/tech-reps/9128.ps\fP
.br
It has very nice description of Bloom filter and it's advantages for password
checking systems.
.PP
In simple words, \fBapgbfm\fP generates \fIn\fP hash values for every word and
sets corresponding bits in filter file to 1. To check the word \fBapgbfm\fP
generates the same hash functions for that word and if all \fIn\fP corresponding
bits in filter file are set to 1 then it suppose that word exists in dicionary.
\fBapgbfm\fP uses \fBmd5\fP as a hash function.
.PP
\fBapgbfm\fP can be used as standalone utility, not only with \fBapg\fP, or
\fBapgd\fP.
.PP
.TP
.B WARNING !!!
This is the first release of \fBapgbfm\fP and filter file format can be changed
in the future. I'll try to make file formats compatible but i can not guaranty this.
.TP
.B WARNING !!!
\fBapgbfm\fP may slow down your computer during filter creation.
.SH "OPTIONS"
.TP
.B -f \fIfilter\fP
use \fIfilter\fP as the name for Bloom filter filename.
.TP
.B -n numofwords
create new empty filter for \fBnumofwords\fP number of words. Useful when you
want to fill filter dynamicaly.
.TP
.B -d \fIdictfile\fP
create new filter from \fIdictfile\fP. It may take a lot of time to
generate filter from a big dictionary. To indicate that program is working
\fBapgbfm\fP prints dot for every 100 words added in dictionary.
.TP
.B -a word
add \fBword\fP to the filter.
.TP
.B -A \fIdictfile\fP
add all words from \fIdictfile\fP to the filter.
.TP
.B -c word
check \fBword\fP for appearance in the filter.
.TP
.B -C \fIdictfile\fP
check every word from \fIdictfile\fP for appearance in the filter.
.TP
.B -v
print version information.
.TP
.B -h
print help information.
.SH "EXIT CODE"
On successful completion of its task,
.B apgbfm
will complete with exit code 0. An exit code of -1 indicates an error
occurred. Textual errors are written to the standard error stream.
.SH "FILES"
.B None.
.SH "BUGS"
.B None.
If you've found one, please send bug description to the author.
.PP
This man page is Alpha too.
.SH "SEE ALSO"
\fBapgd\fP(8), \fBapg\fP(1)
.SH "AUTHOR"
Adel I. Mirzazhanov, <a-del@iname.com>
.br
Project home page: http://www.adel.nursat.kz/apg/