OutGuess - Revision history

Parchivist at 15:49, 31 August 2023

2023-08-31T15:49:21Z

Parchivist at 18:07, 30 August 2023

2023-08-30T18:07:45Z

Parchivist at 20:54, 28 August 2023

2023-08-28T20:54:20Z

Parchivist at 20:54, 28 August 2023

2023-08-28T20:54:06Z

Parchivist: Created page with "{{FormatInfo |formattype=electronic |subcat=Encryption |subcat2=Steganography }} '''OutGuess''' by Niels Provos is a steganography tool that hides information in PNM or [..."

2023-08-28T20:32:13Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Encryption |subcat2=Steganography }} '''OutGuess''' by Niels Provos is a steganography tool that hides information in PNM or [..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Encryption
|subcat2=Steganography
}}

'''OutGuess''' by Niels Provos is a steganography tool that hides information in [[PNM]] or [[JPEG]] files.

OutGuess has been tested on OpenBSD, Linux, Solaris and AIX.

OutGuess preserves statistics based on frequency counts. As a result, statistical tests based on frequency counts are unable to detect the presence of steganographic content. Before embedding data into an image, OutGuess can determine the maximum message size that can be hidden while still being able to maintain statistics based on frequency counts.

OutGuess uses a generic iterator object to select which bits in the data should be modified. A seed can be used to modify the behavior of the iterator. It is embedded in the data along with the rest of the message. By altering the seed, OutGuess tries to find a sequence of bits that minimizes the number of changes in the data that have to be made.

Additionally, OutGuess allows to hide multiple messages (currently only 2) in the data. Thus, it also provides plausible deniablity. It keeps track of the bits that have been modified previously and locks them. A (23,12,7) Golay code is used for error correction to tolerate collisions on locked bits. Artificial errors are introduced to avoid modifying bits
that have a hight bias.

== Links ==
* [https://www.provos.org/p/outguess/ Homepage]
* [https://ftp.mirrorservice.org/sites/ftp.wiretapped.net/pub/security/steganography/outguess/ Download v0.13b (different format)]
* Fridrich, Goljan and Hogea's "[http://www.ws.binghamton.edu/fridrich/research/acm_outguess.pdf Attacking the OutGuess]" is capable of reliably detecting images with content embedded by OutGuess
* [https://farid.berkeley.edu/downloads/publications/tr01.pdf Higher-level statistical tests] detect OutGuess 0.2
* [https://www.provos.org/p/detection-with-stegdetect/ Stegdetect] - detects OutGuess 01.3b files

@@ Line 39: / Line 39: @@
 * [https://github.com/mmtechnodrone/SSAK SSAK] - GUI front end for file identification, data carving, hexdump and steganography programs that includes OutGuess v0.13b
 * [https://github.com/DominicBreuker/stego-toolkit Steganography Toolkit] - Docker image with a bunch of steganography tools including OutGuess v0.13b and v0.2
 * [https://en.wikipedia.org/wiki/OutGuess Wikipedia article]

@@ Line 24: / Line 24: @@
 * [https://farid.berkeley.edu/downloads/publications/tr01.pdf Higher-level statistical tests] detect OutGuess 0.2
 * [https://www.provos.org/p/detection-with-stegdetect/ Stegdetect] - detects OutGuess 01.3b files
-* [https://github.com/mmtechnodrone/SSAK SSAK] - GUI front end for for file identification, data carving, hexdump and steganography programs that includes OutGuess v0.13b
+* [https://github.com/mmtechnodrone/SSAK SSAK] - GUI front end for file identification, data carving, hexdump and steganography programs that includes OutGuess v0.13b
 * [https://github.com/DominicBreuker/stego-toolkit Steganography Toolkit] - Docker image with a bunch of steganography tools including OutGuess v0.13b and v0.2

← Older revision		Revision as of 20:54, 28 August 2023
Line 24:		Line 24:
	* [https://farid.berkeley.edu/downloads/publications/tr01.pdf Higher-level statistical tests] detect OutGuess 0.2		* [https://farid.berkeley.edu/downloads/publications/tr01.pdf Higher-level statistical tests] detect OutGuess 0.2
	* [https://www.provos.org/p/detection-with-stegdetect/ Stegdetect] - detects OutGuess 01.3b files		* [https://www.provos.org/p/detection-with-stegdetect/ Stegdetect] - detects OutGuess 01.3b files
		+	* [https://github.com/mmtechnodrone/SSAK SSAK] - GUI front end for for file identification, data carving, hexdump and steganography programs that includes OutGuess v0.13b
		+	* [https://github.com/DominicBreuker/stego-toolkit Steganography Toolkit] - Docker image with a bunch of steganography tools including OutGuess v0.13b and v0.2

@@ Line 8: / Line 8: @@
 OutGuess has been tested on OpenBSD, Linux, Solaris and AIX.
 OutGuess preserves statistics based on frequency counts. As a result, statistical tests based on frequency counts are unable to detect the presence of steganographic content. Before embedding data into an image, OutGuess can determine the maximum message size that can be hidden while still being able to maintain statistics based on frequency counts.
@@ Line 16: / Line 20: @@
 that have a hight bias.
 == Links ==
 * [https://www.provos.org/p/outguess/ Homepage]
 * [https://ftp.mirrorservice.org/sites/ftp.wiretapped.net/pub/security/steganography/outguess/ Download v0.13b (different format)]
 * Fridrich, Goljan and Hogea's "[http://www.ws.binghamton.edu/fridrich/research/acm_outguess.pdf Attacking the OutGuess]" is capable of reliably detecting images with content embedded by OutGuess
 * [https://farid.berkeley.edu/downloads/publications/tr01.pdf Higher-level statistical tests] detect OutGuess 0.2
-* [https://www.provos.org/p/detection-with-stegdetect/ Stegdetect] - detects OutGuess 01.3b files
+* [https://www.provos.org/p/detection-with-stegdetect/ Stegdetect] - detects OutGuess 0.13b files
 * [https://github.com/mmtechnodrone/SSAK SSAK] - GUI front end for file identification, data carving, hexdump and steganography programs that includes OutGuess v0.13b
 * [https://github.com/DominicBreuker/stego-toolkit Steganography Toolkit] - Docker image with a bunch of steganography tools including OutGuess v0.13b and v0.2