outguess port - universal steganography tool
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26
security/outguess/Makefile
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26
security/outguess/Makefile
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# Makefile for: outguess
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# Version required: 0.13b
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# Date created: Halloween 1999
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# Whom: dugsong@monkey.org
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#
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# $OpenBSD: Makefile,v 1.1.1.1 1999/11/13 20:24:11 dugsong Exp $
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DISTNAME= outguess-0.13b
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CATEGORIES= security
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MASTER_SITES= http://www.physnet.uni-hamburg.de/provos/ \
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http://munitions.vipul.net/software/steganography/
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MAINTAINER= dugsong@monkey.org
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GNU_CONFIGURE= yes
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NO_PATCH= yes
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WRKSRC= ${WRKDIR}/outguess
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post-extract:
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cp ${FILESDIR}/outguess.1 ${WRKSRC}
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.include <bsd.port.mk>
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3
security/outguess/files/md5
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security/outguess/files/md5
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MD5 (outguess-0.13b.tar.gz) = 635356b3a4bd1be8761921af77792f8b
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RMD160 (outguess-0.13b.tar.gz) = 0c7387352e7568edd9d520e1e8e65bc7220ac67a
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SHA1 (outguess-0.13b.tar.gz) = adf927d6d4db8307c3bca08729284e685b681937
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182
security/outguess/files/outguess.1
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security/outguess/files/outguess.1
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.\" outguess manpage, converted from README
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.\" dugsong@monkey.org
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.TH OUTGUESS 1 "6 August 1999"
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.SH NAME
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outguess - universal steganographic tool
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.SH SYNOPSIS
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.B outguess
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[
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.B \-emt
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] [
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.B \-r
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] [
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.B \-k
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.I key
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] [
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.B \-d
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.I datafile
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] [
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.B \-s
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.I seed
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] [
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.B \-i
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.I limit
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] [
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.B \-x
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.I maxkeys
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] [
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.B \-p
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.I param
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] [
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.I inputfile
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[
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.I outputfile
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]]
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.LP
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.SH DESCRIPTION
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.LP
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.I Outguess
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is a universal steganographic tool that allows the insertion
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of hidden information into the redundant bits of data sources. The
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nature of the data source is irrelevant to the core of
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.IR outguess .
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The program relies on data specific handlers that will extract
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redundant bits and write them back after modification. Currently only
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the PPM, PNM, and JPEG image formats are supported, although
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.I outguess
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could use any kind of data, as long as a handler were provided.
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.PP
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.I Outguess
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uses a generic iterator object to select which bits in the data should
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be modified. A seed can be used to modify the behavior of the
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iterator. It is embedded in the data along with the rest of the
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message. By altering the seed,
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.I outguess
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tries to find a sequence of bits that minimizes the number of changes
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in the data that have to be made.
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.PP
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A bias is introduced that favors the modification of bits that were
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extracted from a high value, and tries to avoid the modification of
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bits that were extracted from a low value.
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.PP
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Additionally,
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.I Outguess
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allows for the hiding of two distinct messages in the data, thus
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providing plausible deniablity. It keeps track of the bits that have
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been modified previously and locks them. A (23,12,7) Golay code is
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used for error correction to tolerate collisions on locked bits.
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Artifical errors are introduced to avoid modifying bits that have a
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high bias.
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.SH OPTIONS
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.LP
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The following command line options, when specified as capital letters,
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indicate options for the second message.
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.TP
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.B \-kK \fIkey\fR
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Specify the secret key used to encrypt and hide the message in the
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provided data.
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.TP
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.B \-dD \fIdatafile\fR
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Specify the filename containing a message to be hidden in the data.
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.TP
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.B \-sS \fIseed\fR
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Specify the initial seed the iterator object uses for selecting bits
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in the redundant data. If no upper limit is specified, the iterator
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will use this seed without searching for a more optimal embedding.
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.TP
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.B \-iI \fIlimit\fR
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Specify the upper limit for finding an optimal iterator seed. The
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maximum value for the limit is 65536.
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.TP
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.B \-eE
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Use error correction for data encoding and decoding.
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.PP
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Other options that apply to the general execution of
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.IR outguess :
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.TP
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.B \-r
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Retrieve a message from a data object. If this option is not
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specified,
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.I outguess
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will embed messages.
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.TP
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.B \-x \fImaxkeys\fR
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If the second key does not create an iterator object
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that is successful in embedding the data, the program
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will derive up to specified number of new keys.
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.TP
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.B \-p \fIparam\fR
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Passes a string as parameter to the destination data handler. For the
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JPEG image format, this is the compression quality, it can take values
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between 75 and 100. The higher the quality the more bits to hide a
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message in the data are available.
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.TP
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.B \-m
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Mark pixels that have been modified.
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.TP
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.B \-t
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Collect statistics about redundant bit usage. Repeated use increases
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output level.
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.PP
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For embedding messages, you need to specify a source and a destination
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filename.
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.I Outguess
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determines the data format by the filename extension. If no filenames
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are specified
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.I outguess
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operates as a filter and assumes the PPM data format.
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.SH EXAMPLES
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.LP
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To embed the message
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.I hidden.txt
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into the
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.I monkey.jpg
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image:
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.IP
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.B outguess \-k
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"my secret pass phrase"
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.B \-d
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.I hidden.txt monkey.jpg out.jpg
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.PP
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And in the other direction:
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.IP
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.B outguess \-k
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"my secret pass phrase"
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.B \-r
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.I out.jpg message.txt
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.PP
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will retrieve the hidden message from the image.
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.PP
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If you want to embed a second message, use:
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.IP
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.B outguess \-k
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"secret1"
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.B \-d
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.I hide1.txt
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.B \-E \-K
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"secret2"
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.B \-D
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.I hide2.txt monkey.jpg out.jpg
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.PP
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.I Outguess
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will first embed
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.I hide1.txt
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and then
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.I hide2.txt
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on top of it, using error correcting codes. The second message
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.I hide2.txt
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can be retrieved with
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.IP
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.B outguess \-k
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"secret2"
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.B \-e \-r
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.I out.jpg message.txt
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.LP
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.SH "SEE ALSO"
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cjpeg(1), djpeg(1), pnm(5), stirmark(1)
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.SH AUTHOR
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Niels Provos <provos@citi.umich.edu>
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.SH BUGS
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.LP
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Not all the redundant data available in the JPEG encoding is used,
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this is due to a problem when reconstructing the Huffman coefficients.
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1
security/outguess/pkg/COMMENT
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1
security/outguess/pkg/COMMENT
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universal steganography tool
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12
security/outguess/pkg/DESCR
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12
security/outguess/pkg/DESCR
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OutGuess 0.13b
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--------------
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1999-08-06 - Niels Provos <provos@citi.umich.edu>
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OutGuess is a universal steganographic tool that allows the insertion
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of hidden information into the redundant bits of data sources. The
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nature of the data source is irrelevant to the core of OutGuess. The
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program relies on data specific handlers that will extract redundant
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bits and write them back after modification. In this version the PNM
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and JPEG image formats are supported.
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-d.
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2
security/outguess/pkg/PLIST
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2
security/outguess/pkg/PLIST
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bin/outguess
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man/man1/outguess.1
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